I have just tried the adapter again, I can confirm that the adapter is not the problem, it is only when I have two graphics cards in at once (using the adapter) that it does this. I tried the solution you told me about, by shifting the card and holding it in position, and also I have been testing on my bench so the MB is flat, but no change I tried the T3400 MB again too, no change, but I still don't have an X38-compatible 65NM CPU to test I do have a Pentium D 960, which IS PLGA775 and 65NM, but it is not an officially supported CPU for 30/40 series chipsets, and so understandably does not work on my 430 either.