MacFix
macOS Troubleshooting for M1–M4 Macs
MacFix covers the recurring problems specific to M1 through M4 Macs — kernel_task and thermal throttling, sleep that won't happen, external displays that vanish after wake, disk space APFS snapshots hide, Gatekeeper blocks, and a broken developer toolchain. Every command on this site has actually been run, with real output, a chip, a macOS build number, and a date attached — not paraphrased from a forum thread. See the fleet it's tested on.
Find your problem
Every article lives in one of these seven areas. Pick the one that matches what you're seeing.
Performance
High CPU that isn't really an app, fans at max, slowdowns under load.
Battery
Won't sleep, drains overnight, charges slowly.
Displays
External monitors gone blank, wrong resolution, dock and hub quirks.
Updates
What broke in the current macOS release, and what's just a rumor.
Storage
Disk full for no visible reason, slow file operations, snapshot bloat.
Permissions
Gatekeeper blocks, quarantine flags, permission prompts that won't quit.
Dev setup
Command Line Tools, Homebrew, and Xcode friction after an update.