What if you can't boot your OS or hit a BIOS key?

What if you can't boot your OS or hit a BIOS key?
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If your computer can't load an operating system, because it doesn't detect a bootable drive, it will usually pause, beep and give you the option to enter the BIOS, which it will often call "setup."

However, the biggest problems occur when the system POSTs too fast for you to hit a key and then Windows or Linux tries to boot and fails. I've had this problem when I had a missing or corrupted bootloader, I got the Windows splash screen and then a blue screen of death.

To force the BIOS to appear under these circumstances, you can try using an emergency boot disk, provided that you can either select a boot device at startup or your computer has set an external USB drive as a higher boot priority than its internal storage drive(s).

You can use a Windows 10 install disk as an emergency boot disk. Once the USB boots, you need to click "Repair your computer" instead of install and then click Troubleshoot -> UEFI Firmware Settings -> Restart.

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