Before you try a factory reset, though, it should be noted that there is one less obvious step you can try, particularly if your HP laptop won't boot. What's sometimes referred to as a hard reset ...

Restart your computer. It's incredible how much a simple restart can fix on your computer. If you're having trouble connecting a microphone, try restarting the PC first.

Fix The CMOS checksum is invalid, The CMOS will reset to the default configuration, and the computer will restart CMOS, Reset (502) on HP PC.