“It was fine yesterday and today it just won’t start.” A PC that will not boot is alarming, but the cause is usually one of a handful of things — and most of them are fixable without losing your data. Work through this list from top to bottom; the fixes get progressively deeper.
Narrow it down first
Watch what happens in the first 30 seconds. Do you see the manufacturer logo? A blinking cursor? A blue error screen? Nothing at all? Where it stops tells you whether this is a power problem, a boot-loader problem, or a Windows problem — and points you to the right fix below.
1. Rule out power and peripherals
- Hold the power button 10 seconds to force off, then start again. Laptops: unplug, hold power 30 seconds, reconnect.
- Unplug every non-essential USB device, external drive and SD card — a bad boot order can make the PC try to boot from them.
- Check the monitor cable and input if the screen is black but the PC is clearly running.
2. Stops at the manufacturer logo or drops to BIOS
This usually means the PC cannot find a bootable drive. Enter BIOS/UEFI (tap Del, F2 or F10 at power-on) and confirm your Windows drive is detected and listed first in the boot order. If the drive is not detected at all, reseat it (desktop) or suspect a failing disk — jump to our data-rescue guide.
3. Use Windows Startup Repair
If Windows starts to load then fails, force three failed boots in a row (power off during the loading animation) to trigger the Windows Recovery Environment. Then choose:
- Troubleshoot › Advanced options › Startup Repair — fixes most boot-loader damage automatically.
- System Restore — rolls back to a point before the problem if you have restore points.
4. Rebuild the boot files manually
If Startup Repair fails, open Advanced options › Command Prompt and run:
bootrec /fixmbrbootrec /fixbootbootrec /rebuildbcdsfc /scannowandchkdsk C: /fto repair system files and disk errors.
5. When the built-in recovery itself won't load
Sometimes the recovery environment is damaged too, so you can’t even reach those menus. That is where a bootable recovery USB comes in: it boots the PC from its own clean environment, completely independent of the broken Windows install, giving you Startup Repair, a command prompt, disk tools and file access from the outside.
How our RecoveryUSB handles this
Boot the affected PC from the RecoveryUSB and you get a working repair environment even when Windows’ own one is gone. Run the guided boot-repair, rebuild the boot files, or copy your data off first — the choice is yours, and the step-by-step guide walks you through each one.
Get a RecoveryUSBIf none of this works, protect your data first
Repeated repair attempts on a failing drive can make things worse. If the disk sounds like it is clicking, or keeps disappearing from BIOS, stop and rescue your files before doing anything else.
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 does my PC turn on but Windows won't load?
The hardware powers up but the boot loader or Windows system files are damaged, or the drive is failing. Startup Repair fixes most software causes; a recovery USB helps when the built-in repair won't load.
How do I get into the Windows Recovery Environment?
Interrupt the boot three times in a row (power off while the loading dots spin). On the fourth attempt Windows opens the recovery menu automatically. A recovery USB gives you the same menu on demand.
Can a recovery USB fix a boot problem without reinstalling Windows?
Yes. It repairs the boot loader and system files in place, so Windows and your data stay intact. Reinstalling is only a last resort.