BIOS keeps opening on startup: fixes for boot loops

If BIOS/UEFI opens on every startup, the PC is usually failing to find a bootable drive, or its boot order keeps reverting. Ignoring it can turn a fixable boot-loop into data loss or a dead workstation. This guide shows how to tell a bad setting from a missing SSD/HDD or a failing boot device, then what to check next.

Common Causes of Startup Loop

That usually means the firmware cannot hand off to Windows, so it drops into setup instead of loading the OS. The fastest first check is the boot list: if the internal drive is missing or not first, fix that before changing anything else.

What the screen usually means when Windows does not start

Modern PCs often use UEFI firmware, even when the menu still says BIOS. If setup appears after a normal shutdown, the machine is not treating the internal drive as the next boot target. A single accidental setup entry is different from a repeat loop after every restart.

How to tell a one-time BIOS entry from a boot loop

A one-time entry usually ends after you exit setup, and the PC may boot normally on the next try. A boot loop can keep repeating after each restart or power cycle. If the boot menu does not show an internal OS drive, treat it as a boot-detection issue rather than a key-press issue.

Likely causes, ranked from most to least common

• Boot order points to the wrong device. The firmware may be trying USB, network, or another disk first.
• The boot drive is disconnected or not detected. A loose SATA cable, loose M.2/NVMe drive, or failed connector can stop startup.
• Fast Boot is interfering. It can skip device checks and make startup troubleshooting harder.
• External hardware is changing startup behavior. USB drives and docks can alter what the firmware sees first.
• The CMOS battery is weak. Settings and clock data may not persist after power loss.
• The SSD or HDD is failing. The drive may appear intermittently, then vanish again.

Say your desktop shows the BIOS screen after a clean shutdown, and the 1 TB SSD is still listed in storage but not first in boot order. That points to a configuration problem, not a dead drive. If the same machine later loses the SSD entirely, the diagnosis shifts to hardware.

📊 HP systems may use Esc or F10 for BIOS access. Source: How to Enter the BIOS on a Windows Desktop or Laptop PC.

Is the boot order wrong?

A wrong boot order is one of the easiest fixes, especially when Windows is still installed and the internal drive is visible in firmware. Put the OS drive first, save, and restart. If the firmware still returns after that, move on to drive detection and hardware checks.

Check whether the internal drive appears in firmware

1. Enter setup with the manufacturer key during the splash screen. Common firmware-entry keys often include F2, Del, F10, Esc, and F12, though the exact key varies by computer.
2. Open the boot or storage list.
3. Confirm the internal OS drive appears by name, not just “Windows Boot Manager” or a removable device.

Set the OS drive first when Windows should load

1. In firmware, open Boot or Boot Order.
2. Move the internal SSD/HDD, or Windows Boot Manager tied to that drive, to the top.
3. Save changes and exit.
4. Restart and confirm it leaves setup normally.

Save changes and confirm the system restarts normally

1. Use Save & Exit in firmware.
2. Let the PC complete a full restart.
3. If it returns to setup again, recheck whether the setting stayed in place.

Is a bad boot order causing BIOS to open on startup?

Yes, a bad boot order can force firmware setup if the machine is trying the wrong device first or cannot find a valid OS entry. If the internal drive is present and Windows Boot Manager is available, this is the first setting to correct before suspecting hardware.

Windows Recovery path from inside Windows

If Windows still opens at all, use Settings > System > Recovery > Advanced startup, then select Restart now. The next screen follows Troubleshoot > Advanced Options > UEFI Firmware Settings. On Windows 11 PCs, that path is often a straightforward way back into firmware.

Windows Terminal command path

Open Windows Terminal as an administrator and run shutdown /r /o /f /t 00. That sends the PC into the Choose an Option screen, where you can follow Troubleshoot > Advanced Options > UEFI Firmware Settings. If you miss the timing on a startup key, Windows will load and you must try again.

Is the boot drive missing or loose?

If the internal drive does not appear in firmware, stop adjusting settings and inspect storage connections. A disconnected, loose, or unrecognized drive is a hardware problem first, a software problem second. Replacing settings will not help if the PC cannot see the boot device at all.

Check SATA or NVMe connections on desktops and prebuilt systems

1. Shut the PC down fully and disconnect power.
2. Open the access panel if the design allows it.
3. Check the SATA data and power leads, or reseat the M.2/NVMe module if it is removable.
4. Boot back into firmware and verify the drive appears.

Reseat removable storage where the design allows it

1. For desktops, reseat the drive and its cable once.
2. For laptops, only reseat storage if the service design clearly supports user access.
3. For prebuilt systems with removable trays, confirm the tray is fully latched.

If the drive does not appear in firmware, treat it as a hardware problem

1. Test with only the internal drive connected.
2. Try a different port or slot where the hardware allows it.
3. If the drive still does not appear, run drive diagnostics or replace the drive.

Picture a laptop that boots to setup after every cold start, but the 512 GB NVMe drive vanishes from firmware after shutdown. That points away from boot order and toward a connection or drive fault. Reinstalling Windows will not fix a drive the firmware cannot see.

Could Fast Boot or attached hardware be forcing firmware entry?

Yes. Fast Boot can skip enough device checks to create confusing startup behavior, and attached USB hardware can change what the firmware tries first. If the boot drive is present, turn off Fast Boot and strip the system down to the bare minimum before another test.

Disable Fast Boot while troubleshooting

1. Enter firmware setup.
2. Open the Boot or Startup menu.
3. Turn off Fast Boot.
4. Save changes and restart.

Unplug USB drives, docks, and other peripherals

1. Power the PC off.
2. Disconnect external drives, card readers, docks, printers, and unneeded USB devices.
3. Leave only keyboard, display, and power connected.
4. Restart and check whether it leaves setup.

Restart with only keyboard, display, and power connected

1. Use one wired keyboard if possible.
2. Remove any hub or dock from the startup path.
3. Test again.

Could the CMOS battery be the problem?

A weak CMOS battery can sometimes cause repeated firmware-entry problems if the clock or boot settings do not persist. If the time resets after shutdown, or the boot order keeps reverting, battery failure becomes more likely. On many desktops, replacement is straightforward.

Look for BIOS time resets or settings that do not stick

1. Enter firmware and note the date and time.
2. Save and shut the PC down.
3. Power it back on and check whether the clock or settings changed.

Replace the CMOS battery on a desktop when persistence fails

1. Disconnect power and open the case.
2. Locate the coin-cell battery on the motherboard.
3. Replace it with the same battery type.
4. Re-enter firmware and set time, date, and boot order again.

Retry boot order and startup settings after replacement

1. Set the internal OS drive first.
2. Turn off Fast Boot if needed.
3. Restart twice to confirm the settings persist.

Decision-table checklist: match the symptom to the next step

This checklist helps separate a settings issue from a missing drive or a failing boot device. Start with the row that matches what you see, then stop when the most likely cause is confirmed. If the boot drive is absent in firmware, move to hardware checks before any repair-media work.

Still not working?

If the settings are correct, the drive is present, and the PC still returns to firmware, move to startup repair or hardware service. At that point, the issue is less likely to be a simple configuration error and more likely to be a corrupted boot path or a failing drive.

Use Windows Recovery or installation media to repair startup

1. Reach Advanced Startup from Settings > System > Recovery > Advanced startup, or use shutdown /r /o /f /t 00.
2. Select Troubleshoot > Advanced Options > Startup Repair.
3. If needed, boot from Windows installation media and choose Repair your computer.

When to stop adjusting settings and suspect drive failure

1. The drive disappears from firmware after reseating.
2. The PC boots to BIOS on every restart even with a correct boot order.
3. The drive is detected sometimes, then disappears again.

When to contact the manufacturer or a repair service

1. The storage bay or M.2 slot is not user-accessible.
2. The machine is under warranty and storage is not reliably detected.
3. You need board-level diagnosis for a persistent no-boot condition.

Prevention: after the PC is stable again, keep the internal OS drive first in boot order and avoid leaving removable USB drives attached during shutdown.

Frequently asked questions

why does bios keep opening on startup

It usually happens because the firmware cannot find a valid boot device, or the boot order is wrong. Check whether the internal drive appears first in Boot Order, then verify that Windows Boot Manager or the OS drive is still detected in setup.

how to stop bios on startup

Enter firmware setup, set the internal OS drive first, and save changes. If the PC still returns to setup, disconnect external devices and try again. If the drive is missing from firmware, the fix is hardware-level, not another settings change.

how do I get my PC to boot normally instead of BIOS

Use Settings > System > Recovery > Advanced startup, or run shutdown /r /o /f /t 00, then choose Troubleshoot > Advanced Options > UEFI Firmware Settings. After that, move the internal drive to the top of Boot Order and restart.

can a dead CMOS battery make BIOS keep opening

Yes. A weak battery can make the clock or boot settings reset after shutdown, which can send the PC back to firmware setup. Replace the CMOS battery on a desktop, then set time, date, and boot order again.

what hardware should I check if the computer keeps booting to BIOS

Check the boot drive first, then its cable or slot, plus any USB drives, docks, or peripherals attached at startup. On desktops and some prebuilt systems, reseat SATA or NVMe storage. If the drive is not detected in firmware, treat that as a hardware fault.

when should I suspect the SSD or boot drive is failing

Suspect the drive when it disappears from firmware, appears intermittently, or the system boots to BIOS even after the boot order is corrected. If reseating the drive does not make it show up reliably, the next step is diagnostics or replacement.