Ah sorry for not including the rig, seem to have asked so many people, i forget to give the intricate details.
I have tried removing all but the needed components, my rig is:
E6600 (not overclocked - will do as soon as this is sorted tho)
DS3 rev 2.0
GeiL 2gb 800Mhz
8800gts 640mb
620W Corsair
150mb Raptor (SATA)
DVD (SATA)
Nothing is overclocked yet, as I would like to sort this out first. I really hope its not the PSU and its just a BIOS setting, cos that would save so much time and effort.
I have tried loading back to defaults on the CMOS, but to no avail.
I haven't as yet tried my old PSU.
I have tried removing all but the needed components, as in CPU, gfx, 1 stick of RAM, but iirc i still had this problem, but i could be mistaken - i'll have a second go at this tonight.
Only reason I mentioned the PSU as thats what people have suggested to me could be at fault, and I was wondering if someone has had a similar issue with modular and all thats required is to move rails.
Cheers again