100% dead black screen
no text or HP SPLASH screen now.
The problem is hardware where we buy hardware for free, less than at deity level or a thief. you tell me....
no PC told at all not one tiny clue of 1000s of HP models for 4decades
are we to guess models and lie to you?
now the GENERIC answer
USA PCs only sorry I do not do others.
no beeps> codes
no Caps lock key blink codes. no text errors.?
1: does PC run BIOS pages if huge now shorted old relic battery is removed ,yes bingo 1.
2: is the RTC coin cell dead, ,Bingo 2. a $1 uSD ,USA cost. here.
3: the pre 2010 all have bad CCFL lamps; do this flash light test?
if yes, that is a $50 to $100 USD parts repair , labor more.
repairs are serial process, as fixing one thing bad ,uncovers the next this is how mans machines work just like that.
NO PC told, NO PC told,NO PC told,NO PC told,NO PC told,NO PC told,NO PC told,
all I can do is BEG,