Problem with homebuilt computer

[imported_draino]

I'm building my first computer, and I've run into some problems in getting it to boot up. I've stripped the parts down to just the motherboard, the video card, and a stick of ram. When I press the power button, the fans will spin up, but that's the only thing that happens consistently. Sometimes, I'll get to the post screen and the computer will restart. Sometimes, it will freeze on the Asus splash screen. Sometimes, I will get to the post screen and then the monitor will shift into DPMS off mode. If I reset the rtc ram, I can sometimes get to the BIOS set up screen on the subsequent boot up, but I'm never able to reach the set up screen afterwards. And, sometimes, nothing will happen. The numlock key on my keyboard always works, however, even when the monitor has gone into DPMS mode. The fans on the computer sometimes turn off when the monitor flashes the DPMS mode message; sometimes, they keep going.

I have tried taking my motherboard out and connecting it externally, but the cables are too short. Nonetheless, I checked all the standoffs to make sure the board wasn't touching the case and I reseated the motherboard. I've tried putting the stick in each slot, and that does not seem to make a difference. I've checked all of my connections very carefully. I've made sure that the processor is properly seated.

My motherboard is an Asus P5WD2 Premium; the video card is a BFG Geforce 6600 GTOC (it does not have a connector for additional power); the processor is a pentium 660; and the power supply is an Antec 430 watt neo HE.

One curious thing is that I never hear any beeps when the computer starts up, even when it does make it to the post screen. I'm pretty sure the speakers are plugged in properly.

Any help would be very much appreciated.

 

[mechBgon]

Here's a pic of the board: link. In that pic, the four-pin power fitting at the middle of the bottom edge... got that one hooked up?

Also, at the upper-left corner is the four-pin ATX12V receptacle. That one's hooked up too, correct? It's in an easy-to-miss location up there

 

[imported_draino]

Yes, I've plugged in the EZ Plug, the four pin plug, and the twenty four pin plug.

 

[Marthisdil]

Hmm - shouldn't need to plug in the ez-plug if you have a PS with a 20-pin and 4-pin connector.

 

[boomerang]

You can take the PS out of the case if those are the cables that are too short. The front connectors you don't need right now, just momentarily short across the two power pins to start / shutdown. A phillips screwdriver works great.

I think you've got a bad board though.

 

[Murr045]

Could it be overheating?