I'm back again, after my embarrasment of not finding the cable adaptors.
Slightly worse problem this time though, and i've checked and double checked everything this time. No flamin adaptors anywhere that i've missed I can assure you
So anyway, on with the problem. Everything's connected, gfx card and it's power lead, HDD and it's 2 leads, floppy drive and it's 2 leads (yes, i still use floppy disks now and again), all the connectors to the motherboard etc etc.
I turn it on, it powers up. For all of 3 seconds. It stops. It then tries to start itself again AND!!!! gone again. dammit...
What the h*ll is going on?
I've reconnected everything to a diferent psu but the same thing happens, i've changed the gfx card and even romoved it altogether but the same thing happens. I've left the HDD out but it still happens. Even tried a different HDD but nope, still dies. Checked the RAM, seems fine... Checked everything I can think of. Even faffed about with the front panel connectors. no matter what i do, it just doesn't want to stay on.
If there's anything anyone can think of, please say. I'm going completely insane at the moment.