Motherboard problem, I think!

OK got a new set of components to build a friend's new pc (will give you specs if needed!)

OK so I got it all together as any other build, turned it on and it was fine. Sorted out the bios settings and I noticed that the display was set to pci so I set it to agp, not sure if this is relevant.
Then I installed windows fine, well had a few display problems for some reason, but that seemed to sort itself out eventually.
Anyway finished for the night on Wednesday, came to it yesterday, turned it on and nothing came up on screen. The computer appeared to boot up, well I'm not sure if it's booting up, as nothing's coming up on screen! Case fans and cpu fan spin ok.

I'm not sure what the cause of the problem is, it seems to be on ok as the rom drives open and close normally, no post beeps though, except the usual error ones if I remove the ram or graphics card. I've tried 2 other cards which I know to be working and still the same problem, also tried different memory and tried my 64bit cpu in the board and still the same problem. Tried the processor on my board as it's the same socket and the problem persists.

When I say nothing comes up on screen, it appears to go into standby mode (I know it works because I'm typing from it now!)

The board is a Gigabyte GA-K8NS-Pro and processor is a Sempron 3000+ (second gigabyte board I've had problems with...)

Any ideas or do we reckon it's faulty like I do and the retailer who I spent an hour on the phone to yesterday???!!!!

 

"Tried the processor on my board as it's the same socket and the problem persists."

Are you saying you took the cpu off of the new build, and put it on another motherboard and had the same problem? If so, then it is quite obviously a bad cpu.
If you meant to say the opposite of that, that you took a cpu from another board and put it on that one and it still did not work, then my only guess
would be to make sure that fastwrite is disabled in agp first of all.
And then I would disconnect the power supply cable from the motherboard, and pull the cmos battery off just to make absolute sure that the cmos is reset. Then I would plug it back in and try to boot the system again.

 

Edited....

Though, I'd keep that battery out for a bit of time (5-20 mins).

I recently ran into a machine that had a boot time password. Took the battery out for 5 mins (power supply was not plugged in), put the battery back in, still had the password, tried for 10 mins, same thing, then tried for 20 mins, finally the password went away.

 

Sorry I'm too tired for words lol.

Yeh I took the processor out of the new system, put it in mine and it worked.
Put my 64bit processor in the new system and it still didn't boot, thus eliminating the processor being the problem.
I left the cmos battery out for 10 minutes, would you say taking the 20pin power supply cable out of the board as well as the psu being disconnected from mains power?

EDIT -

Going to bed, going to leave the cmos battery out until tomorrow, also disconnecting all power!

 

I may be missing the point or..

have you tried the onboard (video) or changing to a PCI card ( not using the agp slot)and settings in bios and trying a debug this way....

justathought

 

No onboard graphics and haven't got a pci video card.
I took out the cmos battery all night and disconnected all power, still the same results so it's definitely the motherboard.