This is probably a no brainer but...when I hit the power button the computer tries to fire up but stops dead before initializing much more than the fans. There are no audible beeps or sounds that anything is getting past the initial 1-2 seconds. Definitely no boot screen.
My initial thought is either: A) Power supply B) Power button
This is an older HP system but one that I need to get back up and running because its business related. Please help.
More aboutpush power fans start briefly then turns
I have had the same issue which turned out to be the power supply, if you can try a different psu and see if it works
Can you remove and reinstall the motherboard? Try taking it out, might have a short.