"Pressing the power button does nothing." "It freezes at the Apple logo and never moves on." "It restarts repeatedly after I log in." "A folder with a flashing ? mark appears." A Mac that won't start can look the same on the surface but the cause may be power, storage, a corrupt macOS, or a hardware failure. This article walks through the symptoms first, then steps from light fixes to recovery and DFU restore — covering both Apple Silicon (M1/M2/M3/M4) and Intel Macs, all of MacBook, iMac, Mac mini, and Mac Studio, on macOS Sonoma / Sequoia. If your screen is just black, see How to Fix a Black Screen on Mac; if you reach the login screen but can't get past it, see How to Fix Mac Login Issues.
Table of Contents
- Diagnose first: identify the symptom 1.The power button does nothing 1.It freezes at the Apple logo or progress bar 1.Restarts repeatedly after login (login loop) 1.A flashing folder with a "?" appears 1.Prohibitory symbol or kernel panic screen 1.Symptom-to-fix quick reference
- Check power, charging, and peripherals 1.Inspect the charging cable and adapter 1.Disconnect every USB and external drive 1.Plug into a wall outlet to charge fully
- Force shutdown and restart 1.Force shutdown on Apple Silicon 1.Force shutdown on Intel Macs
- Boot into Safe Mode to isolate the cause 1.Safe Mode on Apple Silicon 1.Safe Mode on Intel Macs 1.What to do once you reach Safe Mode
- SMC / NVRAM resets (Intel Macs only) 1.Reset SMC to clear power and thermal state 1.Reset NVRAM to clear startup disk and resolution
- Repair from macOS Recovery 1.Enter Recovery on Apple Silicon 1.Enter Recovery on Intel Macs 1.Run First Aid in Disk Utility 1.Reselect the startup disk
- Reinstall macOS 1.Reinstall while keeping your data 1.Use Internet Recovery (Intel Macs)
- DFU restore (Apple Silicon)
- When to head to Apple Support / Genius Bar
- Summary: response order when startup fails
Diagnose first: identify the symptom
"My Mac won't start" can mean several different things, and which stage of the boot process is stuck changes both the cause and the fix. Classify your symptom first.
The power button does nothing
You press the power button and nothing responds — no fans, no screen, no charge LED. This points to a fully drained battery, a failed power adapter, or a logic-board failure. On desktop Macs (iMac / Mac mini / Mac Studio), start by checking the power cable and outlet; on a MacBook, charge for at least 30 minutes before pressing the power button again.
It freezes at the Apple logo or progress bar
It powers on and shows the Apple logo, but stops at the logo or progress bar. Typical causes are corrupt macOS system files, a damaged file system, or a misbehaving kernel extension. Safe Mode and macOS Recovery repairs are the right next steps.
Restarts repeatedly after login (login loop)
Password entry succeeds, but right after login the screen blanks and you're returned to the Apple logo → login screen, in a loop. The cause is often a broken login item, corrupted user cache, or a FileVault issue. Boot into Safe Mode to narrow it down.
A flashing folder with a "?" appears
If a folder icon containing a "?" flashes in the center of the screen at startup, the Mac cannot find a startup disk. Causes are ① the startup disk preference changed, ② a disk connection issue, or ③ a failing storage device. Reselecting the startup disk from Recovery is the first step.
Prohibitory symbol or kernel panic screen
A prohibitory symbol (circle with slash) under the Apple logo, or a multilingual white-text screen saying "You need to restart your computer" — these are kernel panics. Possible causes include OS / hardware compatibility issues, kernel-extension crashes, or hardware failure. Boot into Safe Mode to inspect logs and add a hardware test (below) to your diagnosis.
Symptom-to-fix quick reference
- No response: Charge for 30+ minutes → force shutdown → try a different adapter
- Stuck at Apple logo: Force restart → Safe Mode → First Aid in Recovery
- Login loop: Boot Safe Mode → disable all login items → clear user cache
- "?" mark: Reselect startup disk in Recovery → check Disk Utility
- Prohibitory symbol: Verify model's supported OS → Safe Mode → reinstall macOS
- Kernel panic: Disconnect all peripherals → Safe Mode → disable extensions
Check power, charging, and peripherals
Whatever the symptom, the first thing to verify is power and external peripherals. Insufficient power or a problem with an attached device frequently halts the boot sequence.
Inspect the charging cable and adapter
On MacBooks, a fully drained battery won't power on immediately when you plug in the charger. Use an Apple-genuine or MFi-certified cable plus a USB-C or MagSafe adapter, and charge for at least 30 minutes, ideally an hour, before pressing the power button.
- MagSafe-equipped models: Confirm the LED is amber (charging) or green (full)
- USB-C / Thunderbolt charging: Switch to a different port and try a different cable
- iMac / Mac mini / Mac Studio: Make sure the power cable is fully seated and confirm other devices on the same outlet work
- Avoid power strips and extension cords: Plug directly into a wall outlet
If you don't have a genuine adapter, a USB-C PD adapter rated 30W or more plus a USB-C-to-USB-C cable can charge a MacBook as a temporary measure.
Disconnect every USB and external drive
USB devices, Thunderbolt docks, external SSDs/HDDs, SD cards, printers, and other peripherals frequently block startup. Especially in cases like:
- It stopped starting right after you connected a new USB device
- It won't start after you shut down with an external drive attached
- You have multiple devices chained through a USB hub or dock
Unplug every USB and Thunderbolt device and try the power button again with only the wired keyboard, mouse, and power cable connected. This alone often resolves the issue and is the foundation of diagnosis.
Plug into a wall outlet to charge fully
On older MacBooks (with a degraded battery), low battery may prevent power-on. The replacement threshold is below 80% maximum capacity. You can check this in System Information, but if the Mac won't start you can't see that screen — so charge first, judge later.
If charging produces no response and the LED never lights, try alternate cable/adapter combinations. If still nothing, hardware failure is likely (see the Apple Support section below).
Force shutdown and restart
A force shutdown via a 10-second power-button press is the basic way to fully reset a frozen Mac and reboot. Unlike a normal shutdown, unsaved work is lost, but in won't-start situations this often resolves the problem.
Force shutdown on Apple Silicon
This applies to MacBook Air, MacBook Pro, iMac, Mac mini, Mac Studio, and Mac Pro with M1 / M2 / M3 / M4 chips.
- Press and hold the power button for 10+ seconds
- Release when the screen goes black and the fans / charge LED stop
- Wait 5–10 seconds, then press the power button once to boot normally
You may see a "Show Options / Shut Down" dialog during the long press; just keep holding and at 10 seconds the Mac forces off.
Force shutdown on Intel Macs
- On a MacBook, hold the Touch ID / power button (or the upper-right power key) for 10+ seconds
- On an iMac or Mac mini, hold the back/bottom power button for 10+ seconds
- When the system fully shuts down, release the button, wait 5–10 seconds, then power on again
Right after a force shutdown, you may rarely encounter file-system inconsistencies. If macOS shows "Verifying disk" on the next boot, that's the self-repair process — let it complete.
Boot into Safe Mode to isolate the cause
Safe Mode boots macOS without login items, kernel extensions, or font caches. When normal startup is stuck at the Apple logo or in a login loop, Safe Mode is the surest way to test whether the problem is software-related. The procedure is completely different on Apple Silicon vs. Intel — read carefully.
Safe Mode on Apple Silicon
- Fully shut down the Mac (force shutdown is fine)
- Press and hold the power button until "Loading startup options…" appears
- When the startup disk (Macintosh HD) appears, hold Shift and click Continue
- Keep holding Shift; "Safe Boot" appears in the upper corner of the screen and the Mac boots
Safe Mode on Intel Macs
- Shut down or restart the Mac
- Right after pressing the power button, hold Shift
- Release when the login screen appears (you should see "Safe Boot" in the upper-right corner)
If a firmware password is set, you can't enter Safe Mode — it must be removed first.
What to do once you reach Safe Mode
Reaching Safe Mode means macOS itself is fine and the cause is in login items, extensions, or caches. Try these in order:
- System Settings → General → Login Items & Extensions, and disable everything under "Open at Login"
- In the "Extensions" section, disable all third-party extensions (VPNs, virtualization apps, old drivers, etc.)
- Restart normally from Safe Mode (without holding Shift)
- Once it boots cleanly, re-enable login items one at a time to identify the culprit
If Safe Mode itself fails to boot, the issue is below the OS layer — proceed to Recovery.
SMC / NVRAM resets (Intel Macs only)
Intel Macs have an SMC (controls power, thermals, and battery) and an NVRAM (stores resolution, startup disk, etc.) that can be reset. Apple Silicon Macs have neither — these steps are unnecessary and impossible to perform on M1 and later.
Reset SMC to clear power and thermal state
Intel MacBook without T2 chip (2017 or earlier): After shutdown, press left Shift + left Control + left Option + the power button together for 10 seconds → release all keys → press the power button to start.
Intel MacBook with T2 chip (2018–2020): After shutdown, hold right Shift + left Control + left Option, add the power button, and hold all four for 7 seconds → release → wait 5 seconds → press the power button.
iMac / Mac mini (Intel): Shut down → unplug the power cable → wait 15 seconds → plug it back in → wait 5 seconds → press the power button.
Reset NVRAM to clear startup disk and resolution
- Shut down the Mac
- Right after pressing the power button, hold Cmd + Option + P + R
- Keep holding until the startup chime sounds twice (or the Apple logo appears twice)
- Release the keys and let the Mac boot normally
If a flashing "?" folder was the symptom, an NVRAM reset clears the startup disk preference and may let the Mac boot from the internal disk again. After the reset, time zone, volume, and resolution return to defaults — reconfigure as needed.
Repair from macOS Recovery
If Safe Mode also fails or SMC/NVRAM resets don't help, boot from macOS Recovery to repair the disk or reselect the startup disk. The Recovery environment is on a separate partition from macOS, so it's reachable even when normal startup fails.
Enter Recovery on Apple Silicon
- Fully shut down the Mac
- Press and hold the power button until "Loading startup options…" appears
- On the startup options screen, click the Options (gear icon) → Continue
- Enter your administrator password if prompted, and Recovery will start
Enter Recovery on Intel Macs
- Shut down or restart the Mac
- Right after pressing the power button, hold Cmd + R
- Release when the Apple logo appears, and wait for Recovery to load
If your local Recovery partition is broken, Cmd + Option + R (Internet Recovery) downloads the recovery environment from Apple's servers.
Run First Aid in Disk Utility
- From the Recovery menu, choose Disk Utility → Continue
- In the left sidebar, select Macintosh HD (or your startup disk)
- Click First Aid in the toolbar → Run
- When verification and repair finish, click Done
If a "Macintosh HD - Data" volume exists, run First Aid on it the same way. If errors are found, run First Aid again until none are reported. "The disk could not be repaired" indicates a hardware failure — consider restoring from a Time Machine backup.
Reselect the startup disk
For a "?" mark or a Mac that's been pointed at an external drive, reselect the startup disk:
- From the Recovery menu bar, choose Apple icon → Startup Disk
- Select Macintosh HD from the list
- Click Restart
If "Macintosh HD" doesn't appear in the list, a physical connection or hardware failure is likely. Apple Silicon's internal storage is soldered and cannot be user-replaced — contact Apple Support.
Reinstall macOS
If First Aid can't fix it and Safe Mode doesn't help, reinstall macOS. "Reinstall" overwrites only system files, keeping user data, apps, and settings — your data isn't erased (still, back up first to be safe).
Reinstall while keeping your data
- From the Recovery menu, choose Reinstall macOS Sequoia (the version name varies by model)
- Choose Macintosh HD as the destination
- Sign in with your Apple ID if prompted
- Wait until installation completes (30–90 minutes; an internet connection is required)
Never cut the power during reinstall. The Mac may restart several times, so the screen going dark doesn't mean it's done. Keep the MacBook plugged into power.
Use Internet Recovery (Intel Macs)
If even the Recovery partition is corrupted, Intel Macs can use Cmd + Option + R (or Cmd + Option + Shift + R) to download the install image over the internet. Wi-Fi or Ethernet is required, and the Wi-Fi setup screen appears at first boot.
- Cmd + Option + R: Get the latest macOS compatible with your model
- Cmd + Option + Shift + R: Get the macOS that originally shipped with the model (or a near generation)
The latter helps when reviving an older Mac. There's no equivalent on Apple Silicon (in exchange, local Recovery is robust on every Apple Silicon Mac).
DFU restore (Apple Silicon)
For the most severe Apple Silicon cases — Recovery is unreachable, or power comes on but boot never advances — you can restore firmware via DFU (Device Firmware Update) mode. This requires a second Mac and Apple Configurator 2 (free in the App Store).
- Install Apple Configurator 2 on a working second Mac
- Fully shut down the problem Mac (10-second power button press)
- Connect the two Macs with a USB-C / Thunderbolt cable
- Put the problem Mac into DFU mode using the model-specific procedure (steps vary by model)
- Once Apple Configurator 2 sees the problem Mac, choose Actions → Update or Restore
"Update" refreshes only firmware and recoveryOS, so user data is preserved. "Restore" wipes the storage and returns it to factory state, so everything is erased. Always try "Update" first.
DFU restore is the last resort. The exact DFU steps differ per model; check the Apple Configurator 2 User Guide for your specific generation before proceeding.
When to head to Apple Support / Genius Bar
If none of the above helps, hardware failure is likely. If any of the following applies, taking the Mac to an Apple Store (Genius Bar) or Apple Authorized Service Provider is the best path forward:
- The Mac stopped working after liquid damage or a fall
- It's completely unresponsive — even charging produces no LED activity
- Disk Utility reports "The disk could not be repaired"
- DFU restore: Apple Configurator 2 doesn't recognize the Mac
- Kernel panics happen at every boot, and Safe Mode doesn't help
- After the Apple logo, you see vertical/horizontal lines or noise on the screen (classic display failure)
- Battery maximum capacity has degraded significantly (below 80%)
If you can, take a Time Machine backup before bringing it in. AppleCare+ also covers accidental damage. Verify your coverage status in the Apple Support app or at getsupport.apple.com before booking.
Summary: response order when startup fails
Recommended order when a Mac won't start:
- Identify the symptom (no response / Apple logo stuck / login loop / "?" mark / kernel panic)
- Disconnect the charging cable, USB devices, and all peripherals
- For MacBooks, charge for 30+ minutes before pressing the power button
- Force shutdown via 10-second power-button hold → boot normally
- Try Safe Mode
- If Safe Mode works, disable all login items and extensions to find the culprit
- Intel Macs only: try SMC / NVRAM resets
- From macOS Recovery, run Disk Utility → First Aid
- For "?" mark, reselect the startup disk
- Reinstall macOS (data is preserved)
- For severe Apple Silicon cases, try a DFU Update
- If still no go, take it to an Apple Store / Genius Bar
Most won't-start cases are resolved between steps 4 and 8. Rather than mashing the power button, take a moment to match the symptom and proceed step by step — recovery is faster, and so is data safety. For Mac issues in general, see the Mac Troubleshooting Guide.
