Startup problems · Windows 11

Fix a Windows 11 PC that won't boot

Written November 13, 2026

The PC powers on but Windows never arrives: a spinning circle, a black screen, an error, or a loop back to the start. Almost every fix for this lives in one place, the Windows Recovery Environment, and the order matters — automatic repair first, then Safe Mode to separate Windows itself from its drivers, then rolling back whatever changed. This guide works that order.

What you need

• Your BitLocker recovery key, if the drive is encrypted. The recovery tools may ask for it before they touch anything. On most home PCs the key is saved in the Microsoft account the PC was set up with — sign in to that account on a phone or another computer and look under devices for the recovery key. Get it before you start, not mid-repair.
• A second device to read this guide on. The patient cannot display it.
• Optionally, a USB drive of 8 GB or more and a working PC. Only needed if the built-in recovery tools will not open at all — the last section covers making Windows 11 installation media with it.
• Time. Startup Repair and restore operations can each take half an hour. Plug a laptop in and leave it alone while they run.

First, the two-minute checks

1. Unplug everything that is not the screen, keyboard, and power. External drives, USB sticks, docks, and memory cards can all be mistaken for the boot device. A PC trying to start from a data drive looks exactly like a PC with a broken Windows.
2. Force a full power-off, then start once. Hold the power button for ten seconds, wait a few more, then press it once. A machine caught in a half-woken sleep state clears with this more often than it deserves to.

Get into the Recovery Environment

The Windows Recovery Environment (WinRE) is a small repair system that loads before Windows itself. If your PC fails to start twice in a row, it should open on its own to a blue Choose an option screen. If it does not:

1. Interrupt the start, twice. Turn the PC on. As soon as the Windows logo or spinning dots appear, hold the power button until the machine cuts off. Repeat once more. On the next start, Windows treats the run as a failed boot sequence and opens the recovery screen instead.
2. Walk to the advanced tools. On the Choose an option screen, select Troubleshoot, then Advanced options. Everything in this guide lives on that screen: Startup Repair, Startup Settings, System Restore, Uninstall Updates, and Command Prompt.

Run Startup Repair

1. Launch it. From Advanced options, select Startup Repair, then Restart. If asked, choose your Windows installation and enter the BitLocker recovery key.
2. Let it finish. Startup Repair scans for the faults that stop Windows starting — missing or damaged system files, damaged boot configuration, incompatible drivers, registry errors — and repairs what it can automatically. Your files are not touched.
3. Read the verdict honestly. If the PC restarts into Windows, you are done; go to End state. If it reports it could not repair the PC, note the log path it gives (usually C:\Windows\System32\LogFiles\Srt\SrtTrail.txt) and move on — that verdict rules out the easy causes and tells you to test the next layer.

Try Safe Mode

Safe Mode starts Windows with a minimal set of drivers and services. If the PC boots there, the core of Windows is intact and the fault sits in something that normally loads on top of it — a driver, a startup program, a recent change.

1. Open Startup Settings. From Advanced options, select Startup Settings, then Restart.
2. Pick the mode. On the list that appears, press 4 for Safe Mode, or 5 for Safe Mode with Networking if you want internet access during the test.
3. Work the result. If Safe Mode holds, restart normally once — some faults clear with the repair attempts behind them. If normal mode still fails, return to Safe Mode and undo the recent change: uninstall the newest driver or app under Settings > Apps, and remove the latest Windows update under Settings > Windows Update > Update history. If Safe Mode fails too, the damage is deeper; continue to the rollback options.

Roll back: restore points and updates

Both of these live on the same Advanced options screen, and both aim at the same idea: return Windows to the state it was in before the change that broke it.

1. Try System Restore first if a recent point exists. Select System Restore, pick a restore point dated before the trouble started, and confirm. Restore points roll back system files, drivers, and settings; they do not touch your personal files, though programs installed after the point are removed.
2. Remove the latest update if the failure followed one. Select Uninstall Updates. Start with Uninstall latest quality update — the small monthly kind. Only if the failure began right after a big version upgrade, choose Uninstall latest feature update instead. Enter your account password or BitLocker key if asked.
3. Restart and watch. After either rollback, restart normally. A machine that boots after an update is removed has told you its cause; Windows will offer the update again later, and a newer version of it usually lands within weeks.

If the Recovery Environment will not open

A PC that never reaches the recovery screen — it loops, freezes on the maker's logo, or reports no bootable device — needs the repair tools brought to it on a USB drive.

1. Make installation media on a working PC. Download Microsoft's Windows 11 media creation tool, run it with the spare USB drive plugged in, and let it build the installer. Everything on that USB drive is erased in the process.
2. Boot the broken PC from the USB drive. Plug it in, power on, and use the maker's boot-menu key (shown briefly on the first screen, often F12, F8, or Esc) to start from the USB drive instead of the internal drive.
3. Choose repair, not install. On the Windows Setup screen, pick your language, then select Repair your computer in the corner — not Install. You land on the same Choose an option screen; work from Startup Repair onward as above.
4. The last resort on that screen is Reset this PC. Under Troubleshoot, Reset this PC reinstalls Windows. Keep my files preserves your documents but removes apps and settings; Remove everything wipes the drive. Use it only after the repair and rollback options above have had their turn, and only with your files copied elsewhere if the data matters.

End state

• The PC restarts into the Windows sign-in screen three times in a row, unassisted.
• You can sign in, open your files, and the machine stays up under ordinary use for a working session.
• Windows Update is run once by hand, so any half-applied update finishes or is replaced cleanly.
• You know which step fixed it — that is the first thing to check if the fault ever returns.

When it goes wrong

• Every recovery option asks for a BitLocker key you cannot find. Check the Microsoft account used to set up the PC, any work or school account it was ever signed into, and a printed or saved copy from setup. Without the key the encrypted drive cannot be repaired or read, and even a reset can only wipe it — the key hunt is worth real time before anything destructive.
• The PC powers off during a repair. Repairs do not do that; failing hardware does — heat and power are the first suspects. Stop repeating the repair and work the restart and shutdown diagnosis instead.
• No bootable device, or the drive vanishes from the boot menu. That is below Windows' level: reseat the drive if the machine is a desktop you are comfortable opening, and treat a drive that disappears intermittently as a drive to replace, copying data off it the first time it reappears.
• Startup Repair loops: it runs, fails, and offers itself again. A loop means the fault is outside its list. Go to Safe Mode and the rollback steps rather than running it a third time.