This one is the puzzle of all puzzles. My son just recently bought an Xtasy GeForce 4 MX 420. I was in the middle of upgrading my motherboard and chip at the time, so he got my old Abit KT7A-Raid board with a 1Ghz Athlon. Here's the problem. I installed the GeForce4 for him and I got nothing on the screen when I booted up. Of course I reseated the card, checked the cables on the monitor, and checked all my settings but still nothing. I played with it for awhile before finally thinking I had a bad card out of the box. So I tried the same card in my system. Wouldn't you know it.....it booted right up. Took my GeForce3 and put it in my sons system, and it booted right up. Put the GeForce 4 in my other sons computer and it booted right up. Put my others sons Kyro II in my sons and it booted up. Doesn't make any sense at all. The bottom line is that the GeForce 4 MX 420 will not work in the Abit KT7A-Raid board. It does work in my Abit KR7A-Raid and in my sons ECS board. How is this possible and what causes this? Any ideas would be appreciated. Thanks