new computer problems, won't start!

[Blurring]

Hey everyone. I read a lot of topics here and have gained a lot of respect for the information and help given, and now that I have a problem of my own, was hoping somebody might be able to help me.

The parts of my system are:

Motherboard: GIGABYTE GA-P35-DQ6
Video card: 8800 Ultra
Processor: Q6700
Heat sink for that: Thermalright Ultra-120 Extreme w/ AS5
RAM: 4 x 1 GB Corsair XMS2 DDR2 PC 8500
Hard drives: 2 x Western Digital WD5000ABYS 500gb SATA
DVD Drive: Lite-On LH-20A1L-06 SATA
Sound: Creative SE 7.1
Power Supply: Corsair CMPSU-620HX

(I realize I went a little overboard on some parts where I didn't have to) And here's what my problem is:

I originally had everything plugged in, as far as I could tell, correctly. I'd hit the power button, and the system would start up, but 4-5 seconds later, everything would shut down. It'd then start up again, shut back down, etc, until I turned it off. No feed was being sent to the monitor. No beeps from the motherboard.

All the case, GPU, and heat sink fans were getting power and working. DVD-Rom, hard drives, well you get the point, it was all powering on. And all turning off equally.

I did what basic trouble shooting I could, which isn't much. I took everything out besides the motherboard and processor and case fans, and it didn't fix it. Tried each stick of RAM individually to no avail. Reseated the heatsink checking for too much thermal paste or anything else, and everything seemed to be in order.

If anybody has a clue as to what could cause this, please, I'm all ears. It could be something really stupid, I have only built one computer before, so I won't take offense to any suggestions, obviously.

Thanks for any help, I appreciate it a lot.

 

[Cutthroat]

You might have a DOA motherboard.

A couple of things I can think of that you should check...

Triple check that all you power connectors are plugged in and that they are secure.

You did use motherboard standoffs between the case and the motherboard, right?

Can you make it generate any beeps at all no matter what you do? Did the symptoms ever change at all, or was the same loop no matter what you did?

 

[mamrey]

Motherboard standoffs? It might be getting shortd out.

 

[Blurring]

Now when you say standoffs, what do you mean exactly? I'm fairly confident I attached it correctly, if you're referring to the 9 screws that comes out of the case. The middle one in my case however wouldn't work with my motherboard, one of the heat pipes blocked the screw from going in, so I left it out.

As far as doing it correctly though I only used the screws that came with my case and connected those through the motherboard.

As far as repetition, I couldn't get any beeps out of the motherboard. As far as a loop, it ranged from about 3-7 seconds I would say as to how long before it restarted. I couldn't follow any regular pattern except for that.

Thanks for the fast replies!

 

[Cutthroat]

Standoff pic

You should have something that looks like that between the motherboard and the case.

 

[Blurring]

Thanks for the picture, and I do have the motherboard attached to 8 out of 9 of those built into the case.

 

[Cutthroat]

It is sounding like a bad motherboard, unless someone else has an idea. I'd start the RMA process.

 

[Blurring]

In a last attempt I had a friend bring over a computer to swap out some various parts, and it turned 2 of the sticks of ram were DOA.

After removing those two everything seems to be in perfect working order, vista installing now. Thanks a lot for everybodies help!