My pc was working fine. Today I purchased two items. 1. more memory went from 512 to 1gig. The motherboard supports it. I installed the memory and we're still good. The other item purchased was an audio card. My son installed that for me. Now here's the problem. My pc will not start back up. I am lost! When the power button is turned on the light comes on a fan comes on...and that is all. It's not reading the memory and the monitor will not come on. Is it possible when my son installed the card a cable was knocked loose? I have tried to check all the connections. I am running xp pro. Any and all help welcome. Thanks in advance.