The full message usually reads “Reboot and Select Proper Boot Device or Insert Boot Media in Selected Boot Device and Press a Key.” It sounds like you need to do something specific. You don’t, really — the message just means the BIOS gave up looking for a bootable drive on its own and wants you to either point it at the right one or hand it a startup disk.

Why this error appears

This is the BIOS’s generic “I tried everything in my boot list and none of it had a working OS” message. It typically shows up on Asus, Gigabyte, MSI, and some custom-built PCs.

The most common causes:

• A USB stick or external drive plugged in is being treated as the first boot device
• The BIOS boot order has been shuffled (often after a Windows update or BIOS update)
• The CMOS battery has died, causing BIOS to reset to defaults every reboot
• The drive has come loose physically
• The drive has failed

The fix flow

Step 1: Unplug everything you can. External drives, USB sticks, SD cards, even some printers and game controllers can sneak into the boot order. Restart with only essentials connected.

Step 2: Enter BIOS and check the boot order. Press the BIOS key during startup (usually Del for desktops, F2 for laptops). Find Boot Order or Boot Priority. Move “Windows Boot Manager” or your main drive to the top of the list. Save and exit.

Step 3: Verify the drive is detected. While in BIOS, look at the Storage page. If your main drive shows up there, you’re dealing with a settings problem and your data is fine. If the drive is missing, that’s a hardware issue.

Step 4: Check the CMOS battery. If your computer is more than five years old and the date keeps resetting after every shutdown, the CMOS battery is dying. It’s a few-dollar coin-cell battery (CR2032). Once we replace it, BIOS settings will stick.

Custom-build PCs: cable check

If you built the PC yourself or had it built, this error sometimes appears after moving the case or a power outage. Power down, open the side panel, and reseat the SATA data cables and power cables on every drive. Cables back themselves out over time.

When the drive is actually dead

If BIOS can’t see the drive even after reseating, it’s most likely a drive failure. We see this most often on hard drives that have been running for 6+ years or on SSDs that have hit the end of their write cycle. Data is usually still recoverable.

Walk It In

If you’ve tried the above and still see the error, walk it into our 9th Street shop in Durham. We’ll diagnose, quote, and fix — usually within 24 hours of check-in. Mon–Fri 10AM–6PM. (919) 314-3327.

Related errors: “No Boot Device Found,” “Boot Device Not Found,” “Disk Boot Failure, Insert System Disk.”