Problem of the PC CHIPS K7 M851G

[alfeengan]

My compyter is buy a mouth ago.It can use well.But about these two days ,sometimes the screen will be 'black' about half second.
I don't know what is the problem
I have think is it the problem of display card.
If you know why
Please answer me.
Please

 

[ChipDeath]

What, the screen just goes blank momentarily, and then everything returns completely to normal?

Does the power light on the monitor stay green all the time, or does it turn off or change colour perhaps?

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Epox 8RDA+ rev1.1 w/ Custom NB HS
XP1700+ @205x11 (~2.26Ghz), 1.575Vcore
2x256Mb Corsair PC3200LL 2-2-2-4
Sapphire 9800Pro 420/744