HP 400G4 can't get into bios, what should I do?

Hey ......... In this case, you can try the following methods to solve the problem:

Try to reset the BIOS settings: turn on the computer, press and hold the power button, turn the power off, then press and hold the power button and turn on the computer to reset the BIOS settings.

Try updating the BIOS: You can log on to the HP website, find your computer model, download the latest BIOS version, and follow the instructions to update it.

Try replacing the keyboard: If none of the above methods solves the problem, you can try replacing the keyboard to see if that solves the problem.

If none of the above methods solves the problem, you can try contacting HP customer service for professional technical support.