When your computer boots-and after the POST finishes-the BIOS looks for a Master Boot Record, or MBR, stored on the boot device and uses it to launch the bootloader. ![]() You’ll have to look up what different sequences of beeps mean in the computer’s manual. If something is wrong, you’ll see an error message or hear a cryptic series of beep codes. It checks to ensure your hardware configuration is valid and working properly. ![]() The BIOS goes through a POST, or Power-On Self Test, before booting your operating system.
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