Windows won’t start

PC drops into BIOS setup every single time you turn it on

Rather than an occasional glitch, the computer consistently opens the BIOS/UEFI setup screen on every power-on, requiring you to manually select the boot drive or exit each time to reach Windows.

Difficulty
Moderate
Time
20–45 minutes
DIY cost
$5–$15
Pro cost
$60–$150

Symptoms

  • Every boot requires manually navigating out of BIOS setup
  • Sometimes exiting BIOS lets Windows load fine afterward
  • Clock/date may reset between sessions
  • Started after a power outage or battery change

Likely causes

  • CommonDead or weak CMOS batteryThis is the classic cause when settings don't stick between power-offs.
  • CommonA BIOS setting is set to always enter setupSome systems have an explicit setting for this that can get toggled accidentally.
  • PossibleBoot drive intermittently not detected in timeA marginal cable connection can cause the BIOS to fail to find a boot target on some power-ons.
  • PossibleCorrupted BIOS settings after a failed updateFirmware updates that don't complete cleanly can leave inconsistent settings.
  • Less commonKeyboard stuck sending the 'enter setup' keyA physically stuck key (like Delete or F2) can trigger this every time.

What to do

  1. Check whether the system clock/date resets each time you enter BIOS; if so, the CMOS battery is likely dead and should be replaced.
  2. While in BIOS, load 'optimized defaults' or 'setup defaults,' save, and exit to rule out a stray setting causing this.
  3. Check the boot order list to confirm your Windows drive is listed and set first, then save and exit.
  4. For desktops, verify no key is physically stuck by removing the keyboard entirely and testing a boot without one attached.
  5. If it's a laptop, check for a stuck key by very gently pressing and releasing keys near Delete, Esc, and the function row.
  6. If the CMOS battery is suspected, it's typically a small coin-cell battery on the motherboard (desktops) that's inexpensive and straightforward to replace, though on laptops it usually requires opening the case.
  7. If defaults and battery replacement don't help, the motherboard's firmware chip itself may be failing and needs professional evaluation.

Tools and parts

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When to call a pro

If replacing the CMOS battery and resetting BIOS defaults doesn't stop it from entering setup every time, a technician should check the motherboard for a deeper firmware fault.

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.