Why wont my computer screen turn off anymore?

Its a 46" screen, Sometimes when i boot up its fine other times it doesnt do anything. I just stays black. Then i have to turn the power off of the computer and shut it down the wrong way. I am afraid if i don't get this figured out, damage my computer...

I tried booting on my computer and a blue screen came up saying: A problem has been detected and your windows needs to shutdown. Then some like code Then it says if you see this screen once reboot, if you see it again follow these steps. And i did follow...

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...

After running XP Pro on my desktop computer with no problems for 2-3 years, my computer abruptly froze and slightly garbled the screen. When I rebooted, the computer would hang during the boot-up process (the only way to turn it off was to unplug the...

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...

Every time I turn the desk top computer off, the screen turns white. There are a few white lights on behind the screen. It just started a week ago. There is nothing else wrong, the computer works well.

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...

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...

I'm not sure why this happens, i just recently built a gaming computer and all the fans and LEDs turn on inside the computer. Here are the specs my computer. - Asus Motherboard - 2x2 GB Sector 5 RAM - NVidea Geforce 470 video card - AMD phenom black...