Windows won’t start

Fast Startup causing Windows to fail to boot properly

Windows uses a feature called Fast Startup that saves system state to speed up boots, but it can cause the PC to fail to start cleanly, get stuck, or behave inconsistently, especially after hardware changes.

Difficulty
Easy
Time
10–20 minutes
DIY cost
$0
Pro cost
$0

Symptoms

  • PC sometimes won't fully shut down or boots oddly after 'shutting down'
  • Problems appear worse after adding new hardware or dual-booting another OS
  • A full restart often works better than powering off and on
  • Occasional black screens or hangs specifically after using Shut Down rather than Restart

Likely causes

  • CommonFast Startup conflicting with recently added hardwareSaved system state from before a hardware change can mismatch the new configuration.
  • CommonFast Startup interfering with dual-boot setupsIt can lock the drive in a way that prevents another OS from mounting it properly.
  • PossibleCorrupted hibernation file used by Fast StartupSince Fast Startup relies on a hibernation-like file, corruption there can cause boot issues.
  • PossibleDriver that doesn't fully reset between fast startsSome drivers don't reinitialize correctly when the system doesn't fully power off.

What to do

  1. Try a full Restart instead of Shut Down and Power On to see if that avoids the problem, since Restart doesn't use Fast Startup.
  2. Open Control Panel > Power Options > Choose what the power buttons do, click 'Change settings that are currently unavailable,' and uncheck 'Turn on fast startup.'
  3. Fully shut down the PC after disabling the setting, then power it back on to test.
  4. If you dual-boot with Linux or another OS, keep Fast Startup disabled, since it's a known source of boot conflicts in that setup.
  5. If problems persist after disabling Fast Startup, check Device Manager for driver issues as described in other startup guides.
  6. Update BIOS/UEFI firmware and chipset drivers from the manufacturer's site, since these interact closely with power state handling.
  7. If disabling Fast Startup resolves it, leave it off; the speed difference is usually minor on an SSD.

When to call a pro

This is a settings-level fix; if boot problems continue after disabling Fast Startup, treat it as a separate startup issue and consult the relevant guide or a technician.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.