Windows won’t start

Storage drive not detected in BIOS after a firmware update

After updating the computer's BIOS/UEFI firmware, the internal storage drive that previously worked fine no longer appears in the BIOS's list of detected devices, so Windows can't boot at all.

Difficulty
Advanced
Time
30–90 minutes
DIY cost
$0–$60
Pro cost
$100–$250

Symptoms

  • Drive was detected and working before the BIOS update
  • Drive is missing entirely from BIOS storage information after the update
  • PC shows no bootable device or similar error
  • Cables and physical connections haven't been touched

Likely causes

  • CommonBIOS update reset the storage controller mode (AHCI/RAID/NVMe settings)Firmware updates sometimes reset these settings to defaults, which can hide a drive configured differently.
  • CommonBIOS update reset boot mode (UEFI/Legacy) affecting drive visibilityA mismatched boot mode can make an otherwise fine drive appear absent to the boot process.
  • PossibleUpdate itself was interrupted or corruptedA failed flash can leave storage detection partially broken.
  • PossibleDrive connection issue coincidentally occurring around the same timeIt's worth ruling out a simple cable issue even if the timing points to the update.
  • Less commonStorage controller driver/firmware incompatibility introduced by the updateOccasionally an update changes controller behavior in a way that affects specific older drives.

What to do

  1. Enter BIOS/UEFI setup and check the storage controller mode setting (AHCI, RAID, or similar); try switching between available options to see if the drive reappears.
  2. Check the Boot Mode setting (UEFI vs Legacy/CSM) and try switching if the drive was previously installed under a different mode.
  3. Load 'optimized defaults' as a controlled test, saving and rechecking storage detection, since this can reset an incorrectly changed setting.
  4. For desktops, power off, unplug, and reseat the drive's power and data cables to rule out a coincidental connection issue.
  5. Check the motherboard manufacturer's site for a known issue with this specific BIOS version and your drive model or type (SATA vs NVMe).
  6. If a firmware rollback option exists and the new BIOS version is known to be problematic, consider reverting to the previous version.
  7. If the drive remains undetected across all these settings changes, it may need to be tested in another computer to rule out drive failure versus a BIOS compatibility issue.

Tools and parts

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When to call a pro

If changing BIOS storage and boot mode settings doesn't restore drive detection, a technician can determine whether this is a firmware compatibility issue or a coincidental drive failure.

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.