Mac Pro has strange display problems

Hello,
i have a strange problem with my new Mac Pro.
since maybe 1 week the 2 TFT Displays, connected to the nvidia Geforce 7300 GT went black for 2-5 seconds. The 2 Screens display "No signal" during that time.
Is there a way to test my GFX Card ?
any other ideas howto debug that problem at all ?
I am in warranty, but from my point of view, iwant to check first myself, if there is a method to do so.
Best regards
fidel

Hi,
i am going to test the One display test. Thx for this idea
Regarding Monitor Model:
ViewSonic, VX 924
http://www.viewsoniceurope.com/de/Products/LCDX/VX924.htm
Both monitors are connected directly, without any adapters. So no sub-d, only DVI usage.
Regarding AHT:
Is it supposed to check GFX cards too ?
Regarding SMC/PRAM/NVRAM:
I am kinda new to OS X. Could you explain me that in a more detailed way please ?
Regarding 101:
Cant find that point in the 101 page
http://www.apple.com/support/mac101/
thank you very much for the input so far, i am going to test the things, could take some time as i am away for some weeks now. Thank you both.
best regards
fidel

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