Two motherboards not working on my first build

[Raliant]

I've almost finished my first home-built gaming rig. I ordered a GIGABYTE GA-M57SLI-S4 AM2 NVIDIA nForce 570 SLI MCP ATX AMD Motherboard
and when it arrived a week and a half ago, I set it up and I got no power through the mobo. The case fans weren't working, the power LED on the case wasn't working, even my CPU fan wasn't operating. So I RMA'd it and got a replacement that came in today.

A NEW one is doing the same thing, no power.

I've tested two more motherboards with this rig and they work fine. Is there anything I'm not doing right? Should I order a different motherboard?

Here are some stats...

PSU: Antec NeoPower 550W

CPU: AMD|A64 X2 4400+ 2.3G AM2 65N R

CASE: Antec P180

 

[SNGX1275]

Same power supply as the 2 working boards you've tested? Perhaps there is a mistake in the manual on what pin connections you use for the power and reset switches. Poke around in there with a screwdriver and see if you can short 2 together that aren't the 2 you have been putting the power switch to.

If that isn't the problem I don't know what else to suggest. Perhaps you are just extremely unlucky.

 

[Raliant]

It's probably my luck. I've moved the power switch connector around to every pair of pins, and even two of a different color. And I find it hard to believe that this mobo would get that many good reviews when there was a major mistake like that.

Anyway, I'm going to ditch GigaByte and move to Asus to my mobo provider now.

 

[SNGX1275]

lol, good luck. I've had 2 asus boards die on me, and 2 friends have had issues with theirs. On the other hand, I've purchased 2 Gigabyte boards and had them work flawlessly right out of the box.