macOS Error Codes

App Store Error 100 Apple macOS App Store Error 100 means your Mac could not connect to Apple's servers to load … App Cannot Be Opened Apple macOS When a Mac app refuses to open, you might see messages like 'The application … Error 4SNS Apple macOS Apple Diagnostics Error 4SNS means one or more temperature or voltage sensors … Apple ID Locked Apple macOS A locked or disabled Apple ID means Apple has temporarily frozen your account … Audio Not Working Apple macOS When your Mac has no sound, the cause is almost always a software setting rather … Bluetooth Not Available Apple macOS The 'Bluetooth Not Available' error on Mac means macOS cannot communicate with … Disk Utility First Aid Error Apple macOS When Disk Utility's First Aid tool finds errors it cannot repair, it means your … Error 2003F Apple macOS Apple Diagnostics Error 2003F means the built-in hardware test found a problem … External Drive Not Showing Apple macOS When an external drive does not show up on your Mac, it could be a cable … FaceTime Not Working Apple macOS FaceTime not working on Mac usually means one of three things: FaceTime cannot … iCloud Error 54 Apple macOS iCloud Error 54 'Operation Not Permitted' means iCloud tried to sync a file but … iCloud Sync Error Apple macOS iCloud sync errors on Mac mean your files are not uploading to or downloading … macOS Installation Failed Apple macOS The 'macOS Installation Failed' error means the macOS installer could not … Kernel Panic Apple macOS A kernel panic is macOS crashing at its deepest level — the core of the … Keychain Access Error Apple macOS Keychain errors on Mac mean the system that stores your passwords, certificates, … Mail Not Working Apple macOS When Apple Mail stops working, you might see messages like 'Cannot receive … Messages Not Working Apple macOS When iMessage stops working on Mac, messages either fail to send, show as … Permission Denied Apple macOS A 'Permission Denied' error on Mac means your user account does not have the … Printer Not Working Apple macOS When your Mac cannot print, the most common causes are the printer showing as … Safari Cannot Open the Page Apple macOS Safari's 'Cannot Open the Page' error means Safari could not load the website … Screen Won't Turn On Apple macOS A completely black Mac screen can mean the display hardware has failed, macOS … Spinning Beach Ball Apple macOS The spinning rainbow beach ball (officially called the Spinning Wait Cursor) … Spotlight Not Working Apple macOS When Spotlight stops finding files or apps, it usually means the search index … Startup Disk Almost Full Apple macOS The 'Your disk is almost full' warning means your Mac's main drive is running … Time Machine Error 11 Apple macOS Time Machine Error 11 means the backup could not be completed because of a … Time Machine Error 256 Apple macOS Time Machine Error 256 means the backup could not be completed due to an … Time Machine Error 45 Apple macOS Time Machine Error 45 means the backup drive cannot be accessed or is not … macOS Update Error -1 Apple macOS macOS Update Error -1 is a generic failure code that appears when the Software … macOS Update Error 403 Apple macOS macOS Update Error 403 means your Mac was denied access to Apple's update … Wi-Fi Not Working Apple macOS When your Mac's Wi-Fi is not working, it could mean the Wi-Fi is off, you are … macOS Won't Boot Apple macOS When your Mac gets stuck on the Apple logo or the loading progress bar at …