Cos I was bored , I looked again at the system
![Grin ;D](http://forum.giga-byte.co.uk/Smileys/default/grin.gif)
1) all cables etc connected to correct wires / polarity correct / all cables new out of box
2) RAM / Graphics card inserted correctly
3) formatted and reinstalled Windows xp pro sp3 , slip-streamed disc with Nlite
disconnected 2 x 100mm additional case fans that I had connected to the mobo ( pwr_fan #5 in user manual and sys_fan #19 ) clicking much reduced , CPU fan operating much as normal , though overall temp up
CPU temp now showing 32c
So suspect Power supply cant provide enough power through motherboard
![Huh ???](http://forum.giga-byte.co.uk/Smileys/default/huh.gif)
If you have additional fans , try pulling the plug on them