Mac troubleshooting: problems from connection checks to system boundaries.

AirDrop is not working between a Mac and iPhone

Enable Wi-Fi and Bluetooth on both devices, put them nearby, open AirDrop on the Mac and make the receiver discoverable, then restart both devices. Confirm Contacts Only has matching Apple Account contact details. AirDrop also needs the screen on and unlocked on the receiving device, so wake it before you send.

Mac app window opens off screen

A window can remain positioned for a disconnected monitor. macOS window commands, display arrangement and temporarily changing resolution can bring it back without deleting app preferences.

Mac cannot find a Wi-Fi printer

Confirm the printer and Mac are on the same Wi-Fi, resolve any printer display error, then add it from System Settings › Printers & Scanners. Prefer AirPrint when the printer supports it; reset the Mac printing system only as a last resort.

Mac does not detect an external display

Verify how many displays the exact Mac supports, reconnect power and the cable, choose the correct display input, then use Displays settings to detect or arrange it. Test a direct compatible cable before a dock or adapter.

Mac is connected to Wi-Fi but the internet does not work

Check the same network on another device, turn Wi-Fi off and on, restart the Mac and router, then run Wireless Diagnostics. Forget the network or change TCP/IP/DNS settings only after recording the current configuration. A Mac that connects but loads nothing may need only a DNS change, so note which of the two you see.

Mac System Data uses too much storage

System Data can include caches, logs, local snapshots, device backups and support files. Identify the category and backup state before deleting hidden folders.

Mac will not accept the password after an update

After an update, the login screen may expect the local Mac password while users enter an Apple Account password, or the keyboard layout/FileVault state may differ. Verify the account and input before recovery.

MacBook fan runs constantly or very loudly

A sustained fan usually follows CPU/GPU load, charging, blocked airflow, room heat or a process stuck in the background. Use Activity Monitor before force-quitting broadly.

USB-C hub stops working after sleep

A hub that fails after sleep may have power-delivery, firmware, cable or one peripheral problem. Direct connections separate the Mac port from the hub.

Apple Handoff and Continuity behaves incorrectly or produces the wrong result

Apple Handoff and Continuity is not working

Apple Handoff and Continuity is unusually slow or delayed

Apple Handoff and Continuity keeps disconnecting or working intermittently

Apple Handoff and Continuity stopped working after an update, outage or hardware change

Apple Handoff and Continuity works in one app, account or port but not another

Mac iCloud Drive sync behaves incorrectly or produces the wrong result

Mac iCloud Drive sync is not working

Mac iCloud Drive sync is unusually slow or delayed

Mac iCloud Drive sync keeps disconnecting or working intermittently

Mac iCloud Drive sync stopped working after an update, outage or hardware change

Mac iCloud Drive sync works in one app, account or port but not another

Mac Spotlight search index behaves incorrectly or produces the wrong result

Mac Spotlight search index is not working

Mac Spotlight search index is unusually slow or delayed

Mac Spotlight search index keeps disconnecting or working intermittently

Mac Spotlight search index stopped working after an update, outage or hardware change

Mac Spotlight search index works in one app, account or port but not another

Mac startup disk behaves incorrectly or produces the wrong result

Mac startup disk is not working

Mac startup disk is unusually slow or delayed

Mac startup disk keeps disconnecting or working intermittently

Mac startup disk stopped working after an update, outage or hardware change

Mac startup disk works in one app, account or port but not another

Mac Thunderbolt display connection behaves incorrectly or produces the wrong result

Mac Thunderbolt display connection is not working

Mac Thunderbolt display connection is unusually slow or delayed

Mac Thunderbolt display connection keeps disconnecting or working intermittently

Mac Thunderbolt display connection stopped working after an update, outage or hardware change

Mac Thunderbolt display connection works in one app, account or port but not another

Mac Time Machine backup behaves incorrectly or produces the wrong result

Mac Time Machine backup is not working

Mac Time Machine backup is unusually slow or delayed

Mac Time Machine backup keeps disconnecting or working intermittently

Mac Time Machine backup stopped working after an update, outage or hardware change

Mac Time Machine backup works in one app, account or port but not another

Mac unexpected restart or kernel panic behaves incorrectly or produces the wrong result

Mac unexpected restart or kernel panic is not working

Mac unexpected restart or kernel panic is unusually slow or delayed

Mac unexpected restart or kernel panic keeps disconnecting or working intermittently

Mac unexpected restart or kernel panic stopped working after an update, outage or hardware change

Mac unexpected restart or kernel panic works in one app, account or port but not another

MacBook battery condition behaves incorrectly or produces the wrong result

MacBook battery condition is not working

MacBook battery condition is unusually slow or delayed

MacBook battery condition keeps disconnecting or working intermittently

MacBook battery condition stopped working after an update, outage or hardware change

MacBook battery condition works in one app, account or port but not another

macOS app privacy permissions behaves incorrectly or produces the wrong result

macOS app privacy permissions is not working

macOS app privacy permissions is unusually slow or delayed

macOS app privacy permissions keeps disconnecting or working intermittently

macOS app privacy permissions stopped working after an update, outage or hardware change

macOS app privacy permissions works in one app, account or port but not another

macOS update installation behaves incorrectly or produces the wrong result

macOS update installation is not working

macOS update installation is unusually slow or delayed

macOS update installation keeps disconnecting or working intermittently

macOS update installation stopped working after an update, outage or hardware change

macOS update installation works in one app, account or port but not another

Universal Control between Mac and iPad behaves incorrectly or produces the wrong result

Universal Control between Mac and iPad is not working

Universal Control between Mac and iPad is unusually slow or delayed

Universal Control between Mac and iPad keeps disconnecting or working intermittently

Universal Control between Mac and iPad stopped working after an update, outage or hardware change

Universal Control between Mac and iPad works in one app, account or port but not another