{
  "id": "mba-m1-blank-screen",
  "modelId": "mba-m1",
  "title": "Blank screen: last visible startup stage",
  "intent": "Record normal startup and Options visibility before further recovery decisions.",
  "category": "diagnostics",
  "sourceIds": [
    "mac-blank",
    "mac-diagnostics",
    "mac-display",
    "mac-service",
    "mac-safety"
  ],
  "diagramId": "laptop-m1-startup",
  "prerequisites": [
    "Screen remains blank at startup",
    "Owner understands possible unsaved-work loss from forced shutdown"
  ],
  "tools": [
    "Undamaged compatible power supply"
  ],
  "steps": [
    {
      "id": "scope",
      "text": "Distinguish the built-in screen from an external monitor. Record any logo, progress or Options previously visible; a brief blank period differs from a persistent blank screen.",
      "sourceIds": [
        "mac-blank"
      ],
      "locator": "Opening / external display note"
    },
    {
      "id": "power",
      "text": "If normal shutdown is unavailable, Apple describes holding power/Touch ID for up to 10 seconds until off, then turning on. Consider unsaved work before this necessary forced shutdown.",
      "sourceIds": [
        "mac-blank"
      ],
      "locator": "Turn your Mac off and back on"
    },
    {
      "id": "options",
      "text": "From off, holding power on M1 can show startup Options. Release at Options and record whether it appears; this observation does not require erase, reinstall or firmware work.",
      "sourceIds": [
        "mac-diagnostics"
      ],
      "locator": "Apple silicon, steps 1–2; observation-only scope"
    },
    {
      "id": "route",
      "text": "If the built-in desktop works, route an external-only blank screen to the single-display task. Otherwise preserve normal-startup and Options results separately.",
      "sourceIds": [
        "mac-blank",
        "mac-display"
      ],
      "locator": "External display note / If still need help"
    },
    {
      "id": "data",
      "text": "Tell Apple about backup availability before discussing Recovery or firmware procedures. The service provider should assess any data-affecting next action.",
      "sourceIds": [
        "mac-blank",
        "mac-service"
      ],
      "locator": "Recovery / cannot start Recovery; Make a backup"
    }
  ],
  "checks": [
    {
      "id": "safety",
      "question": "Is there swelling, a lifted case or trackpad, liquid damage, smoke, a burning smell, or damaged power equipment?",
      "goal": "Establish whether any powered comparison is safe.",
      "sourceIds": [
        "mac-safety"
      ],
      "options": [
        {
          "id": "safe",
          "label": "No visible danger",
          "next": "scope"
        },
        {
          "id": "danger",
          "label": "Yes, or suspected damage",
          "next": "stop"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    },
    {
      "id": "scope",
      "question": "Which screen is blank?",
      "goal": "Avoid treating an external monitor as the startup screen.",
      "sourceIds": [
        "mac-blank"
      ],
      "options": [
        {
          "id": "built-in",
          "label": "Built-in or both",
          "next": "startup"
        },
        {
          "id": "external",
          "label": "External only; built-in works",
          "next": "external"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    },
    {
      "id": "startup",
      "question": "Did normal startup become visible after the safe power check?",
      "goal": "Record the observed recovery.",
      "sourceIds": [
        "mac-blank"
      ],
      "options": [
        {
          "id": "yes",
          "label": "Login or desktop visible",
          "next": "ready"
        },
        {
          "id": "no",
          "label": "Still blank",
          "next": "options"
        },
        {
          "id": "skip",
          "label": "Power check skipped for data/safety concern",
          "next": "attention"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    },
    {
      "id": "options",
      "question": "Did M1 startup Options appear?",
      "goal": "Preserve the last accessible independent stage.",
      "sourceIds": [
        "mac-diagnostics"
      ],
      "options": [
        {
          "id": "yes",
          "label": "Options visible",
          "next": "service"
        },
        {
          "id": "no",
          "label": "Options unavailable",
          "next": "service"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    }
  ],
  "terminals": {
    "ready": {
      "type": "preparation_saved",
      "title": "Visible startup recorded",
      "text": "Back up accessible files and retain this event for recurrence.",
      "handoff": [
        "Record normal versus forced shutdown.",
        "Keep earlier screen and accessory observations."
      ]
    },
    "external": {
      "type": "maintenance_possible",
      "title": "Compare the external display",
      "text": "The built-in desktop works; investigate the monitor connection.",
      "handoff": [
        "Use one supported native display.",
        "Separate detection from visible image."
      ]
    },
    "attention": {
      "type": "maintenance_possible",
      "title": "Preserve the unperformed power check",
      "text": "Ask Apple to guide the next action with the data concern visible.",
      "handoff": [
        "State why the attempt was skipped.",
        "Provide backup and unsaved-work availability."
      ]
    },
    "service": {
      "type": "service_needed",
      "title": "Arrange startup support",
      "text": "Options visibility and continued blank startup need Apple review.",
      "handoff": [
        "Share the last visible stage.",
        "Discuss backup access before recovery or firmware work."
      ]
    },
    "uncertain": {
      "type": "preparation_saved",
      "title": "Keep the unanswered checks visible",
      "text": "The screen scope or last visible stage is unconfirmed.",
      "handoff": [
        "Provide built-in/external scope and Options availability.",
        "State backup status and skipped attempts.",
        "Keep unperformed conditions marked Not tested. Ask the provider to confirm these before further changes."
      ]
    },
    "stop": {
      "type": "service_needed",
      "title": "Stop the powered checks",
      "text": "Stop using or charging damaged equipment. Keep away from hot or smoking equipment; obtain emergency help for an immediate fire risk. Arrange manufacturer guidance before handling or transport.",
      "handoff": [
        "Tell Apple about the visible damage before arranging a MacBook Air service.",
        "Provide built-in/external scope and Options availability.",
        "Do not open the case, remove the battery, press a lifted surface, or continue a test to complete this record."
      ]
    }
  },
  "missing": "The screen scope or last visible stage is unconfirmed.",
  "handoff": [
    "Provide built-in/external scope and Options availability.",
    "State backup status and skipped attempts."
  ],
  "outcomeChecks": [
    "Normal startup and Options are separate.",
    "No data-affecting recovery action was inferred."
  ],
  "workflow": {
    "family": "startup-diagnostics",
    "summary": "Capture the last visible stage before recovery decisions.",
    "osOptions": [
      "macos26-plus",
      "macos-earlier",
      "macos-unknown"
    ],
    "fields": [
      {
        "id": "blank-scope",
        "label": "Blank screen",
        "type": "select",
        "options": [
          {
            "value": "unknown",
            "label": "Not checked"
          },
          {
            "value": "built-in",
            "label": "Built-in"
          },
          {
            "value": "external",
            "label": "External only"
          },
          {
            "value": "both",
            "label": "Both"
          }
        ]
      },
      {
        "id": "last-stage",
        "label": "Last visible stage",
        "type": "select",
        "options": [
          {
            "value": "unknown",
            "label": "Unknown"
          },
          {
            "value": "none",
            "label": "None"
          },
          {
            "value": "logo",
            "label": "Logo/progress"
          },
          {
            "value": "options",
            "label": "Options"
          },
          {
            "value": "login",
            "label": "Login/desktop"
          }
        ]
      },
      {
        "id": "power-attempt",
        "label": "Power attempt",
        "type": "select",
        "options": [
          {
            "value": "not-done",
            "label": "Not performed"
          },
          {
            "value": "normal",
            "label": "Normal shutdown/start"
          },
          {
            "value": "forced",
            "label": "Necessary forced shutdown/start"
          }
        ]
      }
    ],
    "matrix": {
      "title": "Startup visibility",
      "rows": [
        {
          "id": "normal",
          "label": "Normal startup",
          "condition": "Built-in screen with safe power"
        },
        {
          "id": "options",
          "label": "M1 Options",
          "condition": "Hold power from off; release at Options"
        },
        {
          "id": "external",
          "label": "External path",
          "condition": "Only when built-in desktop works"
        }
      ],
      "results": [
        {
          "value": "not-tested",
          "label": "Not tested"
        },
        {
          "value": "works",
          "label": "Works in this condition"
        },
        {
          "value": "fails",
          "label": "Fails in this condition"
        },
        {
          "value": "intermittent",
          "label": "Intermittent"
        },
        {
          "value": "not-applicable",
          "label": "Not applicable"
        }
      ]
    },
    "reportFocus": [
      "Last stage",
      "Screen scope",
      "Data risk"
    ],
    "notDoneGuidance": [
      "Do not erase, reinstall or restore to fill a row.",
      "A skipped power cycle remains Not tested."
    ]
  },
  "entityKind": "task",
  "version": "2.0.0",
  "deviceFamily": "laptop",
  "modelApplicability": {
    "id": "mba-m1",
    "name": "MacBook Air M1",
    "family": "laptop",
    "revision": "MacBook Air (M1, 2020), Apple M1 chip",
    "os": "macOS Big Sur or later; Ventura and later call the preferences app System Settings. Diagnostic screens vary by macOS.",
    "region": "US-first; local repair provider requirements vary.",
    "help": "Choose Apple menu → About This Mac. Confirm MacBook Air (M1, 2020) and Chip: Apple M1. An Intel processor or another chip does not match.",
    "exclusions": [
      "MacBook Air Intel 2020",
      "MacBook Air M2",
      "MacBook Pro M1"
    ],
    "sourceIds": [
      "mac-id",
      "mac-spec",
      "mac-diagnostics"
    ]
  },
  "exclusions": [
    "MacBook Air Intel 2020",
    "MacBook Air M2",
    "MacBook Pro M1"
  ],
  "materials": [
    "Keep any existing backup accessible to you.",
    "Keep credentials and personal files outside this record."
  ],
  "stopConditions": [
    "Stop using and charging equipment with swelling, casing separation, smoke, a burning smell or suspected battery damage. Do not open or press on it.",
    "Set damaged accessories aside. Do not open mains adapters or force connectors.",
    "Do not erase, reset, flash firmware or bypass a lock as a default diagnostic step."
  ],
  "branches": [
    {
      "from": "safety",
      "answer": "safe",
      "to": "scope"
    },
    {
      "from": "safety",
      "answer": "danger",
      "to": "stop"
    },
    {
      "from": "safety",
      "answer": "unknown",
      "to": "uncertain"
    },
    {
      "from": "scope",
      "answer": "built-in",
      "to": "startup"
    },
    {
      "from": "scope",
      "answer": "external",
      "to": "external"
    },
    {
      "from": "scope",
      "answer": "unknown",
      "to": "uncertain"
    },
    {
      "from": "startup",
      "answer": "yes",
      "to": "ready"
    },
    {
      "from": "startup",
      "answer": "no",
      "to": "options"
    },
    {
      "from": "startup",
      "answer": "skip",
      "to": "attention"
    },
    {
      "from": "startup",
      "answer": "unknown",
      "to": "uncertain"
    },
    {
      "from": "options",
      "answer": "yes",
      "to": "service"
    },
    {
      "from": "options",
      "answer": "no",
      "to": "service"
    },
    {
      "from": "options",
      "answer": "unknown",
      "to": "uncertain"
    }
  ],
  "sources": [
    {
      "id": "mac-blank",
      "title": "Mac starts up to a blank screen",
      "url": "https://support.apple.com/en-us/102575",
      "locator": "Turn off and on / Recovery / Service",
      "purpose": "Up-to-10-second power action and service routing; this worksheet excludes disk/firmware operations",
      "checkedAt": "2026-10-13",
      "reuse": "Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-diagnostics",
      "title": "Use Apple Diagnostics to test your Mac",
      "url": "https://support.apple.com/en-gb/102550",
      "locator": "Prepare / Apple silicon / Run Apple Diagnostics / Results",
      "purpose": "M1 Options then Command-D; Tahoe 26+ selected tests versus earlier automatic testing; preserve reference code",
      "checkedAt": "2026-10-13",
      "reuse": "Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-display",
      "title": "External display dark or low resolution",
      "url": "https://support.apple.com/en-gb/102501",
      "locator": "Connections / Support limits / Detection / Accessory permission",
      "purpose": "Direct video path, Detect Displays and detection versus image",
      "checkedAt": "2026-10-13",
      "reuse": "Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-service",
      "title": "Get your Mac ready for service",
      "url": "https://support.apple.com/en-us/116942",
      "locator": "Make a backup / Arrange service / Check settings",
      "purpose": "Data may be erased or storage replaced; actual-OS service requirements; original post-service acceptance worksheet",
      "checkedAt": "2026-10-13",
      "reuse": "Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-safety",
      "title": "Important safety information for your Mac",
      "url": "https://support.apple.com/guide/macbook-air/important-safety-information-apd9b8f7aa11/mac",
      "locator": "Handling / Built-in battery / Charging",
      "purpose": "General damaged-equipment and moisture safety only; M1-specific connections are sourced from mac-spec",
      "checkedAt": "2026-10-13",
      "reuse": "Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-id",
      "title": "Identify MacBook Air model",
      "url": "https://support.apple.com/en-ie/102869",
      "locator": "Find model / MacBook Air M1 2020",
      "purpose": "Model and chip confirmation",
      "checkedAt": "2026-10-04",
      "reuse": "Reference only. Original paraphrase; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-spec",
      "title": "MacBook Air (M1, 2020) technical specifications",
      "url": "https://support.apple.com/en-us/111883",
      "locator": "Charging and Expansion / Display Support",
      "purpose": "Two USB-C Thunderbolt/USB4 ports and one native external display up to 6K at 60 Hz",
      "checkedAt": "2026-10-13",
      "reuse": "Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    },
    {
      "id": "mac-safe",
      "title": "Start up your Mac in safe mode",
      "url": "https://support.apple.com/guide/mac-help/start-up-your-mac-in-safe-mode-mh21245/mac",
      "locator": "Apple silicon / Verify safe mode",
      "purpose": "M1 power, startup volume, Shift + Continue in Safe Mode and Boot Mode verification",
      "checkedAt": "2026-10-13",
      "reuse": "Reference only. Original paraphrase and observation worksheets; no copied images or manual pages.",
      "licenseStatus": "Public support document; no redistribution license assumed."
    }
  ],
  "assets": [
    {
      "id": "laptop-m1-startup",
      "path": "/assets/laptop-m1-startup.svg",
      "title": "M1 startup routes",
      "alt": "Original schematic: hold power to Options; Command-D for diagnostics or select volume and Shift for safe mode. Diagnostics divides by macOS version.",
      "sourceIds": [
        "mac-diagnostics",
        "mac-safe"
      ],
      "caption": "Original schematic. M1 uses startup Options. Tahoe 26+ offers a test choice; earlier macOS tests automatically. Unknown OS remains unconfirmed.",
      "kind": "Original schematic"
    }
  ],
  "relatedIds": [
    "mba-m1-diagnostics",
    "mba-m1-safe-mode",
    "mba-m1-usbc-charge"
  ],
  "estimatedDuration": {
    "minutes": 20,
    "label": "Planning estimate for recording observations; excludes charging, backups, drying and service. Not a measured repair time."
  },
  "legacyVersion": "1.0.0",
  "legacyChecks": [
    {
      "id": "safety",
      "goal": "Separate unsafe hardware from routine preparation.",
      "question": "Any swelling, casing separation, liquid damage, smoke, burning smell, or damaged battery/adapter?",
      "sourceIds": [
        "mac-charge"
      ],
      "options": [
        {
          "id": "safe",
          "label": "No visible danger",
          "next": "check-1"
        },
        {
          "id": "danger",
          "label": "Yes, or suspected damage",
          "next": "stop"
        },
        {
          "id": "unknown",
          "label": "I cannot confirm",
          "next": "uncertain"
        }
      ]
    },
    {
      "id": "check-1",
      "goal": "Make a bounded non-invasive check.",
      "question": "Have you checked safe power and attempted the sourced restart once?",
      "sourceIds": [
        "mac-blank",
        "mac-diagnostics"
      ],
      "options": [
        {
          "id": "yes",
          "label": "Yes",
          "next": "check-2"
        },
        {
          "id": "no",
          "label": "No",
          "next": "attention"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    },
    {
      "id": "check-2",
      "goal": "Separate reachable startup UI from a persistent blank display.",
      "question": "Can the built-in display show startup Options?",
      "sourceIds": [
        "mac-blank",
        "mac-diagnostics"
      ],
      "options": [
        {
          "id": "yes",
          "label": "Options visible",
          "next": "ready"
        },
        {
          "id": "no",
          "label": "Still blank",
          "next": "service"
        },
        {
          "id": "unknown",
          "label": "Not checked / unsure",
          "next": "uncertain"
        }
      ]
    }
  ],
  "legacyPreparation": [
    "Screen is blank at startup",
    "Data-preservation concerns are understood",
    "Undamaged compatible power supply",
    "A private place to keep your findings",
    "A current backup if the device is accessible"
  ]
}