2x Motherboards - one works, one doesn't

[z1pp3r]

Hey there

I've just bought 2x Gigabyte N650SLI-DS4 motherboards, one for upgrading my old system, one for a complete new setup for a friend of mine. My friends system works like a charm but i'm having some trouble.

When I hit the power button, the pc turns on, the fans start spinning, but I get nothing on my monitor. There is an Intel E6750 cpu in both setups, and both are using a Chill Innovation 450A-2 PSU, although mine seems a bit older since it only has a 2x2 pin connector for ATX_12v while my friends brand new PSU has a 2x4 pin connector.

There is a plastic-thingie covering 4 of the pins on the motherboard, and according to the manual you dont have to remove the plastic-thing unless your PSU supports a 2x4 pin ATX_12v connector, and if you're using an intel Extreme cpu, they recommend that you use it also (although doesnt seem to require it).

Any ideas?

 

[skreet]

Start using the hardware from your friends rig for troubleshooting. I highly doubt it's a PSU issue, but test that as well.

 

[Penalty]

You can probably answer your own question by swapping the PSU's between the systems. I had to do that last weekend. Mine turned out not to be a PSU issue

It's really not as much work as I thought, maybe 15-30 mins

 

[SerpentRoyal]

Strip the board bare and put it on a non-conductive surface. Install CPU, mouse, keyboard, GPU, and one stick of RAM. Disconnect power from PSU. Clear CMOS. If you cannot access BIOS, then try the RAM from the other PC. Still no go? Try the PSU from the other PC. Still no post? Swap GPU. Final step is to RMA the board.

 

[z1pp3r]

Okay, so i tried putting my PSU in my friends pc and as expected, it did not boot up.

"Yes!" i thought, and went to buy a new PSU. I should probably have tested some more, but i have been using all the other parts in my former setup for some months and they are rock stable.

Installed the new psu (with a proper 2x4 pin connector) and guess what? It is _STILL_ not able to output anything to the monitor.

I'm really running out of ideas here, i've double-checked every power connector several times, it all looks fine =/

(And for this, i only have my geforce 7900gt, cpu and ram installed)

edit: SerpentRoyal: I'll try your suggestion, thanks