Power Mac G5 Tower starts up, but no display...

I've got a PowerMac G5 tower that powers up, I hear the fans ramping up, but no display > black screen. I've tried 2 different monitors...same thing.
What could this be? PRAM?
Thanks for any expertise,
Sunny

graphic card is one possibilty.
As to the swap, which exact G5?
Some use AGP cards like G4s, some need PCIe cards, also which g4 card, some or most won't work in a G5 even if yours is AGP.
If you don't know the model, find the Serial# & use it on one of these sites, but don't post the Serial# here...
http://www.chipmunk.nl/klantenservice/applemodel.html
http://www.appleserialnumberinfo.com/Desktop/index.php
How to find the serial number of your Apple hardware product...
http://support.apple.com/kb/HT1349

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