No signal to Monitor and requires manual shutdown?

I have 2 computers with similar problems 1st Computer Specs Acer brand Processor: AMD Athlon Duel core 64 Bit 2 GB Ram 500GB hardrive ATI Radeon intergrated Graphics card Windows Vista home edition 2nd Computer Gateway Intel Pentium Duel core 64 bit 6GB Ram 1TB Hardrive Windows 7 Home edition My main issue is that both computers have problems with connecting with the monitor. I have tested the monitor on an old XP machine and works great. The windows 7 computer will start up occasionally and will run for an average of about 10 minutes and then it shuts off the signal to the monitor. The computer remains on but is non responsive. It then requires a manual shutdown. The windows Vista computer will not ever fully connect with the monitor. This computer does not respond to manual shutdown. I have to shut off via power supply. I have heard of reinstalling the chipset drivers as well as the graphics card drivers, which I plan on for the windows 7 computer. I cannot do anything with the vista computer. Could this possibly be a video card failure? Everything seems to work fine internally from what I can tell, but have not had it looked at by a professional. I would rather fix it my self if I can. I just need to know where to start on the vista computer. Thanks in advance.
Answer:

This sounds like a graphics card issue, not a driver issue. It appears that the vista computer has had a complete failure in the integrated graphics, but the windows 7 machine is in the process of failing. This generally happens from over heating. Once it becomes damaged, it doesn't take long for it to overheat again.

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Take it to a PC local vendor see if they can help you with the problem. Good luck.

Most graphic cards have several output connectors so it could be that you are connecting to the wrong one, usually the topmost one is the primary. It could possibly be a graphic card problem but try one of the other cable ports first. Usually you have to turn on the monitor prior to the computer but with Windows 7, that doesn't seem to be much of a problem as I've found that turning on the monitor after the computer does not affect the connection however, if you have dual connections, the primary sometimes does not connect but the secondary (to TV) does always work. The only other concern is that the PSU is not providing enough power for all of the devices so if the PSU is not more than 550 watts then that is your problem (for both PC's)..

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