OK, so I got 2 512mb sticks of Crucial PC-2700 in the mail today, so I go to put them in. I removed the old (2x256mb pc2100) I booted up, and all I got was a long beep, then a pause, long beep, pause. Over and over again. So i tried to go back to my old memory, same thing. I reseated the memory and video card about 5 times now. Any suggestions?