Ok, my sisters computer just died and after testing all the components in it (except memory and cpu which I don't have anything to test them with) I bought a new motherboard for the computer assuming that it had went bad (possibly due to lightning strike since it was doing sporadic things like turning itself off after 15 minutes for no reason, etc...). I got the new motherboard in and put it in but it did not fix the problem. The main problem I am having is that the video card is not recognized by the computer. I have tried 3 different video cards in the machine which I know work and none of them are recognized by the computer (the monitor light just stays yellow on boot). The power supply seems to be fine so I don't believe that is the problem. My next step is to purchase a processor for the machine, however, I'm wondering (before I do that) if there may be some setting or some jumper that I did not set correctly or maybe some connector that would cause it not to see the video card. I also tried reseating the cards. I have unplugged everything from the computer except power supply, video card, processor and memory. Any ideas if I'm forgetting anything or does this sound more like a processor or memory issue? Is there anyway to test either of them (since I don't have a computer that can take either of them to test with). Please let me know what your recommendations are!