My monitor goes black after a while?

I'm using my computer and "Poof" my screen goes black! I've turned off power management, I,ve put in a new video card, I,ve rebooted over and over till I get a dos screen Then I,m up again but who knows how long annd it will do it again! No rime or reason it seems. What's Up!

 

Have you looked at This Thread?

 

Yes I did look at it, and I really feel my problem is different.
Could it be Power supply problems?
I,m going to upgrade to a big momma P4 2-4 (whatever I can get) processor and motherboard so I,m going to be needing a new power suply anyway, But I still thhink it's weird it just started doing it. Nothing feels hot on the board, but one HD seemed abit' hottish.
I,m right now a amd 700, 128 ram guy now with 2 HD's a cd writer, a regular cd, and a new AIW radeon 7500
Anyway dats' my story

 

1) Talking about the MONITOR overheating...not the board or cpu.

Yes a PS issue could cause this. so could bad memory.

 

Well Thanks JTOAST I'm going to replace all dat' stuff including ram anyway so hopefully that will fix it.

Another Ouestion?? Where can I get me that old antique "Windows 98 second addition", FULL Program not upgrade?