When a Mac won’t start, the screen usually tells you what’s wrong: a flashing question mark means it can’t find a startup disk; a stuck Apple logo or progress bar means macOS is failing to load; a prohibitory circle means the system is incompatible or damaged. Most of these are fixable with the tools built into macOS Recovery.
First: know your Mac's chip
The startup keys differ. Apple Silicon (M1/M2/M3): shut down, then press and hold the power button until “Loading startup options” appears, then choose Options. Intel: turn on and immediately hold Command (⌘) + R until the Apple logo or spinning globe appears.
Step 1 — Basic resets
- Hold the power button 10 seconds to force off, then start normally.
- Disconnect all external devices, hubs and adapters, then try again.
- Intel Macs: reset the SMC and NVRAM (hold Option+Command+P+R for 20 seconds at startup).
Step 2 — Boot into macOS Recovery
Use the chip-specific keys above to reach the macOS Utilities screen. From here you can repair the disk, reinstall macOS, or restore from a Time Machine backup — all without erasing your files (unless you choose to).
Step 3 — Repair the disk with First Aid
In macOS Utilities, open Disk Utility, select your startup disk (usually “Macintosh HD”), and click First Aid. This checks and repairs directory and file-system errors — a very common cause of a Mac that won’t boot.
Step 4 — Try Safe Mode
Apple Silicon: hold power to reach startup options, select your disk, then hold Shift and click “Continue in Safe Mode.” Intel: hold Shift right after powering on. Safe Mode loads a minimal system and clears some caches; if it boots, a login item or extension is the culprit.
Step 5 — Reinstall macOS (keeps your files)
If First Aid and Safe Mode don’t help, choose Reinstall macOS from macOS Utilities. This replaces the system software while leaving your data in place. If the built-in recovery is itself damaged or offline, a bootable macOS installer on USB does the same job offline — see our bootable macOS USB guide.
How our RecoveryUSB handles this
Our Mac OS install USB boots your Mac when its own recovery won’t — letting you run Disk Utility, reinstall macOS offline, or copy your files off first. It ships pre-built for your macOS version with a clear step-by-step guide, so you don’t need a second working Mac to make one.
Get a RecoveryUSBBack up before erasing
Reinstalling macOS normally keeps your files, but if you plan to erase the disk, rescue your data first — boot to Recovery or our USB and copy it to an external drive.
Skip the trial and error — use a ready-made RecoveryUSB
Every RecoveryUSB ships pre-built and tested, with a step-by-step guide. Free fast worldwide shipping.
Shop Recovery USBsFrequently asked questions
Why is my Mac stuck on the Apple logo?
macOS is starting but failing partway — usually a disk/file-system error, a bad update, or an incompatible extension. Running First Aid in macOS Recovery, then Safe Mode, resolves most cases.
What does a flashing question mark on a Mac mean?
The Mac can't find a valid startup disk. Boot into Recovery and use Disk Utility's First Aid; if the disk isn't detected at all, it may need reinstalling macOS or hardware service.
Can I reinstall macOS without losing my files?
Yes. Choosing 'Reinstall macOS' from macOS Recovery (or a bootable installer USB) replaces the system software but leaves your personal files in place. Only 'Erase' removes data.