Computer Screen won't turn on?

Hello I have a old HP pavilion with a 19in brand new screen. Recently the computer haven't been working as use to. First what was happening was that when the computer goes to sleep mode it wont wake up again, in the screen i just have the message no...

A couple of days ago my computer wouldn't turn off, it had froze. So I held down the power button so it could power off, it did. The next day I go and try to cut my computer on and everything seems to be fine. It boots up as normal but the screen would...

my computer screen wont turn on help the computer is on i can hear it but the screen dont turn on the lil light stays amber insted of turning green and then poping a display up. ive tryed unpluging and repluging everything ive pushed the video card in...

just the screen wont turn on..but the tower runs and everything, just cant see anything.

when i turn it on i can hear the fan and everything but it wont go to where i log in my user it says press DELETE or TAB for bios message or something like that but then after it just goes to a blank black screen and a little white bar at the top left...

It had a blue screen with a crash dump error then it turned off. Now when I turn on you can hear the fans and everything but the screen doesnt turn on...

It had a blue screen with a crash dump error then it turned off. Now when I turn on you can hear the fans and everything but the screen doesnt turn on...

I'm not sure what type of computer it is because it's was a gift but It wont turn on. The little light by the button is orange but it wont turn green like it's supposed to and I cant get it to turn on...Any Idea whats wrong with it???

ok this all started the other night when I shut down my computer tp go to bed (everything was working fine) until I tried to cut it back on...I can hear the start up noise and my usb drive stick lights up but the screen is still black I tried the following...