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New build boots and starts to load Win7 then switches off after about 75 seconds. Why????

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October 31, 2013 5:35:06 AM

New build Gigabyte GA990FXA-UD5, 16Gb DDR3, Phenom ll X4 / AMD Fan, 2Tb SATA3 HDD.
At initial switch on machine switched off after maybe 10 seconds.
Short circuited BIOS on MB to instal original BIOS. Machine then allowed stepping thru and completion of BIOS changes and save.
Machine now comes on normally, completes POST and starts to load WIN7 from CD.
Shortly afterwards (say 70 seconds) machine closes down.
Obviously I cannot proceed further until I can load Win7 and Drivers>
FYI - I have tested by replacement the HDD, RAM. Graphics Card, and 2 X DVDs
So fault is between CPU, MB and PSU (800W)

Any suggestions welcomed
October 31, 2013 5:51:33 AM

What does "Short circuited BIOS on MB to instal original BIOS. Machine then allowed stepping thru and completion of BIOS changes and save." mean?
October 31, 2013 6:19:26 PM

The MB and the CPU were pre-loved but reputed to be working.
When I first completed building this machine, I checked all the connections and switched on. The macjine switched itself off after about 15 seconds.
I was not sure how the previous owner might have set it up so I decided to wipe the CMOS by shorting the 2 pins on the MB - Clearing CMOS Jumper - to re-load the factory defaults>
I was then able to get the machine to BOOT, go thru POST and select BIOS Setup which I then saved.
From that point on the machine would usually BOOT, POST, get to setup screen and allow me to select the WIN7 Operating system disc in the DVD drive to start to load Win7 onto my SATA HDD.
The machine usually falls over after about 70 seconds after switching on.
The PSU appears to stay on after shutdown.
!