I've been trying to get my Athlon750 system up and running but I can't get the video (or anything else for that matter) to initialize. I am wondering if I might be using too small of a Power Supply. Currently I'm using a 250 watt supply which I was told where I bought it that 250 would be enough. The power supply is also not on the list of AMD approved Power Supplies, is it important that I have one of these listed units?