I have a PowerMac 2.5Ghz Dual Processor. It came with 2Ghz but I am testing it with two 256 sticks only. Also, I am testing it with a 64MB AGP card which isn't stock. When I turn the system on it blinks white on the front and the fans kick on and all but I never get a bootup. I reset the PRAM but it didn't restart the system like it said. Any suggestions? It wouldn't have to do with me only trying to boot it up with 512 would it?