PC turns on for split second then turns off, repeatedly.

[ta2]

Recently transferred my components to a new case. Different power supply, graphics card, sound card and hard drives.

The problem is that when I take the power cable out, or flick the PSU power switch, then turn it back on again - all the fans start up and everything for about a second, then it turns off, repeatedly.

I fix this by taking the battery out and flicking the CMOS clear switch and putting the battery back in. It then comes up "press F1 for setup / F2 for defaults". Everything works good now, Windows and all. Trouble is, the whole process starts happening again if I turn off the PSU/take the power cable out.

No idea what the cause is. Any help is very much appreciated.

Thanks!

[jordan427]

Dud CMOS battery perhaps? Do you leave your PC on for long periods at all?

[ta2]

Sorry forgot to say I have tried 2 brand new batteries plus the original one.