I was playing some games for a few hours and when I shut off the computer It needed to update. During its update it kept restarting the screen but nothing would start up. After a while I tried to start my pc back up and the keyboard lit up but the screen didn't. Then the tower beeped 8 times then switched to 2 long beeps and 2 short beeps that repeats 5 times then nothing. The tower stays lit but the screen never turns on.
Sounds like mine did when my BIOS update got cut off when the power went out. From another computer you can go to HP Support and get detailed info on your BIOS and how to fix it. You might be able to get into BIOS when it first starts up and fix it that way also.