graphics card problem?

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I have a problem with a customers computer.
When the computer runs for some time it displays no signal message on my monitor and starts a high pitch whistle?
graphics chipset is built in. and have cleared the mobo of any dust etc.
any help much appreciated
cheers

 

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are there any power saving settings in effect?
Is there adaquate airfolow to prevent over heating?
Have you tested it with a different monitor?

 

Well it sounds like a hardware failure of the on-board graphics. You could try installing the latest drivers, in case a software bug is causing this and if that doesnt work, i would suggest you purchase a cheap graphics card.