Boot Issues: Fix a Windows PC That Won’t Start

When a Windows PC will not reach the sign-in screen, first identify whether it has no power, no display, a failed Windows boot, or a restart loop. Check power, display connections, the battery or desktop hardware, and external devices before using Windows Recovery Environment; then try Startup Repair, Safe Mode, System Restore, or recent-update removal in that order. These steps are intended to preserve personal files, but protect important files before troubleshooting a drive that may be failing.

What exactly happens when you press the power button?

Watch and listen during the first few seconds. The symptom tells you which part of startup has failed.

No lights, fan noise, or charging indicator

The computer is not receiving usable power, or its power hardware has failed. A desktop may have a loose cable, switched-off power supply, failed power button, or faulty internal component. A laptop may have a flat or failed battery, damaged charger, or charging-port problem.

Power lights or fan noise, but the screen stays black

The PC may be running while the display is not working. The problem could be the monitor input, cable, dock, graphics output, memory, or display panel. If you hear Windows sounds or see keyboard lights respond, treat this as a display problem first.

Manufacturer logo appears, then Windows does not load

This is a failed Windows boot. Startup files, a recent driver or update, file-system damage, or the system drive may be involved.

The PC keeps restarting before reaching the sign-in screen

This is a restart loop. A failed update, driver, system file, overheating problem, or hardware fault can cause it. Note whether the loop begins at the manufacturer logo, the Windows logo, or after the sign-in screen.

Write down any exact message, including No bootable device, Operating system not found, or a blue-screen stop code. The wording helps distinguish a missing drive from damaged Windows files.

Which boot issue are you dealing with, and what can you safely try?

These symptoms point to different parts of the PC, so do not start with a reset. No lights usually indicates a power-delivery problem. Lights with no image usually points to the monitor, cable, graphics output, or another hardware component. A Windows logo followed by an error usually points to startup files, an update, a driver, or the storage drive. No bootable device or Operating system not found can mean the drive is disconnected, not detected, or no longer contains a usable boot entry.

This guide applies to supported Windows 10 and Windows 11 PCs, including laptops and desktops. Menu names vary by manufacturer. Cable, battery, and display checks do not require Administrator permission. Recovery tools use the permissions they need; commands run from a Command Prompt in Windows Recovery Environment require Administrator access. Do not run commands from another operating system unless you know which Windows volume and boot partition they refer to.

Before changing Windows, disconnect nonessential USB devices, remove discs and memory cards, and check the monitor or charger. If the PC starts, copy important files to another drive before continuing. A restart is required for some checks and repairs. Recovery tools such as Startup Repair and System Restore are intended to preserve personal files, but a failing drive can worsen at any time.

Do not choose Reset this PC, format a partition, delete partitions, or reinstall Windows while files are inaccessible. These actions can remove applications and, depending on the choice, personal data.

Try these fixes in the safest order

Start with checks that do not alter Windows. Use Recovery only if the basic checks do not restore startup.

1. Turn off the PC completely. Hold the power button until it shuts down if it is frozen, then disconnect the power cable. For a laptop, disconnect its charger. If the battery is removable, remove it according to the manufacturer's instructions.
2. Check the wall outlet with another device, then reconnect the desktop power cable firmly at both ends. Check that a desktop power-supply switch is set to I or On. Use the charger supplied with the laptop, inspect it for cuts or bent connectors, and check whether its charging indicator appears.
3. Disconnect docks, USB storage, printers, phones, memory cards, and external hubs. Leave only the power cable, monitor, keyboard, and mouse connected. A faulty USB device can interfere with startup or make the firmware try to boot from the wrong device.
4. If the computer has power but no image, turn on the monitor separately, select the correct input, and reseat the video cable. Try another cable, monitor input, or the PC's other video output if available. On a laptop, try the display-toggle key shown on its keyboard and disconnect external displays.
5. Power the PC on again. If it reaches the Windows sign-in screen, reconnect devices one at a time and restart after each connection. The device connected just before the failure is a likely cause. If there are still no lights or charging signs, stop before opening the case unless you are qualified to work on that hardware.

If the manufacturer logo appears but Windows fails, open Windows Recovery Environment. Windows may enter it automatically after several interrupted starts. You can also start the PC and interrupt startup by holding the power button when the Windows logo appears, repeating this only until Windows displays Preparing Automatic Repair or recovery options. Another route is to boot from a Windows installation USB and choose Repair your computer, not Install now.

From the recovery menu, choose Troubleshoot and then Advanced options.

6. Select Startup Repair. Choose the Windows account if asked and enter its password. Startup Repair checks common boot-configuration and startup-file problems without intentionally removing personal files.

Expected result: Windows starts normally and reaches the sign-in screen. If Startup Repair reports that it could not repair your PC, return to Advanced options and try the next suitable option instead of repeating Startup Repair indefinitely.

7. Choose Startup Settings, select Restart, and press the key for Safe Mode or Safe Mode with Networking. Safe Mode loads a limited set of drivers. If it starts, remove a recently installed driver or application from Settings, then restart normally.

Settings > Apps > Installed apps
Settings > Windows Update > Update history

Expected result: Windows reaches the desktop in Safe Mode and starts normally after the suspected driver, application, or update is removed. If Safe Mode also fails, the cause may be outside the normal driver set or may involve storage or hardware.

8. If the failure began after a system change, use System Restore from Advanced options. Choose a restore point dated before the problem. System Restore normally leaves personal files alone but removes drivers, applications, and system changes made after that point.

Expected result: Windows starts and the recent change is undone. If no restore point exists or the restore fails, return to the recovery options.

9. If Windows stopped booting immediately after an update, choose Uninstall Updates and try the most recent quality update first. Use the feature-update option only when the problem clearly began after a major Windows version upgrade.

Expected result: Windows starts after the problematic update is removed. If the option is unavailable or has no effect, do not keep removing updates at random.

For a blue screen, record the stop code and the file named on the screen. From Safe Mode, remove a recently added driver or hardware component and check for signs of overheating. From Recovery, use System Restore or uninstall a recent update. A single blue screen can be a software fault; repeated blue screens with different codes can indicate memory, storage, power, or motherboard trouble.

If you see No bootable device or Operating system not found, enter firmware setup using the key shown by the manufacturer, often F2, Delete, Esc, or a function key. Check whether the internal drive appears and whether Windows Boot Manager is listed as the first boot option. Do not change storage-mode settings such as AHCI or RAID casually; changing them can prevent an otherwise healthy Windows installation from starting.

If the drive is visible but Windows still will not boot, use Windows Recovery's Command Prompt only if you can identify the Windows volume. Drive letters in Recovery may differ from those used in normal Windows. A technician or a Windows installation environment can inspect the partitions safely. Avoid commands that format, clean, delete, or rebuild partitions until files are protected.

If the drive is not visible in firmware, recovery tools cannot find it, or it makes clicking or grinding sounds, treat the issue as a possible drive failure. Stop repeated start attempts and move to file recovery or hardware repair.

How do you know the problem is fixed?

A successful repair ends with more than one lucky boot. Start Windows normally, reach the sign-in screen, and confirm that your usual account opens without a recovery message.

Check that your personal folders—Desktop, Documents, Pictures, and other important locations—are present. Confirm that the system drive has the expected free space and that Wi-Fi, keyboard, mouse, and display work. If you used Safe Mode, restart once more and make sure the normal desktop loads.

Test several complete restarts rather than relying on sleep or hibernation. Watch for the same error returning, unusually slow disk activity, missing files, freezes, or another restart loop. Review Windows Update and Device Manager only after the system is stable, then create a current backup before making further changes.

If the PC starts only after a particular USB device is removed, only in Safe Mode, or only after each repair, record that detail. It can identify a failing accessory, driver, update, or drive if the issue returns.

When should you stop and get help?

Stop troubleshooting and seek hardware repair or data-recovery help if the computer has a burning smell, liquid damage, visible electrical damage, severe overheating, or repeated power failures. Do not keep powering on a drive that clicks, grinds, disappears from firmware, or causes the PC to freeze during file access. Repeated attempts can make recovery harder.

If files are important and Windows cannot start, prioritize copying or recovering them before replacing the drive or reinstalling Windows. A repair shop may be able to connect the drive to another computer or create a sector-by-sector image. Tell the technician not to format or reinstall until you approve it.

A BitLocker recovery prompt is not the same as a normal sign-in prompt. You may need the recovery key associated with your Microsoft account, organization, or saved records. Do not guess keys or disable encryption through destructive steps. If you cannot locate the key and the files matter, ask for help before changing the disk.

Get help when Startup Repair, Safe Mode, System Restore, and update removal have all failed; when the internal drive is not detected; or when the computer has recurring blue screens after software changes are undone. Professional repair is safer than reinstalling Windows when the likely cause is failing hardware or when personal files have not been backed up.

Conclusion

If the power and display checks fail, or Recovery tools cannot find the Windows drive, stop before resetting or reinstalling. Protect the files, record the exact error and recent changes, and use a repair or data-recovery service when hardware failure is possible. Once Windows starts reliably, make a backup before returning the PC to normal use.

Frequently Asked Questions

Will Startup Repair delete my personal files?

Startup Repair is designed to repair common startup problems without intentionally removing personal files. It cannot protect files from a failing drive, so make a backup or seek recovery help as soon as Windows becomes accessible.

Why does my PC say “No bootable device” after I unplugged a USB drive?

The firmware may be selecting the wrong boot entry, or the internal drive may not be detected. Remove other bootable devices, check whether the internal drive and `Windows Boot Manager` appear in firmware, and avoid changing storage settings unless you know their original values.

Should I reset Windows if Startup Repair does not work?

Not immediately. Try Safe Mode, System Restore, or removal of a recent update first. If files are inaccessible, the drive is missing, or hardware symptoms are present, protect the files and get help before considering a reset.