Glad the topic was there and wish I had looked at the forum sooner.
I spent all day and all night yesterday troubleshooting every single component trying to figure out why my machine would turn on and immediately cut the power off as soon as I pressed the power switch.
Bypassing the switch with the ATX Pwr header would turn the PSU on but the CPU and southbridge would stay off and none of the 1.1V, 1.2V and 1.8V rails had any power.
I hadn't turned on the X1000 for the last 9 months as I had been working on building a very special case for it for Amiwest and it was so frustrating after putting everything together to have to take everything apart to diagnose the motherboard :-/