If you see the HP BIOS error 500 or 501 on starting your system and you cannot boot into Windows, the solutions explained here will help you.

The CMOS battery is an often overlooked but crucial element. Hidden on the motherboard of your computer, it acts like an emergency power supply for the BIOS.

Alternatively, remove the power cable, remove the CMOS cell battery from the motherboard, and then press and hold the power button for 30 seconds. Replace the battery and cables, and try again.

Saving BIOS data prior to the battery change and configuration is strongly recommended. How to identify and change the CMOS battery? You need to begin by locating the CMOS battery, which is a thin, ...