My just over 2 old years hiper PSU failed just recently and I've replaced it with a seasonic x900. My PC works fine mostly, but since changing the PSU I've had an intermittent fault in that my PC slows down to less than a crawl, so bad it takes minutes to respond to a mouse click. If I reboot it will sometimes be fine or it might take and age to boot into XP and even the BIOS screens can be slow. I've been trying to find the apparent hardware fault, undone my overclocks, reseated cards and RAM. I even thought maybe my CPU HSF might be failing. The only thing I've been able to find wrong is on the main motherboard power connection:
Sorry about the blurry image, my camera has a faulty flash. As you might be able to see, one of the connectors in the plug was out of it's proper seating. Could this be the cause?