Can't boot up into BIOS... motherboard bad?

[Proprioceptive]

Alright guys, so I just built my machine and it's been a couple days. I first loaded up everything just fine and everything was working properly until I would play games or do anything graphics intensive. A couple minutes, or sometimes right away, my machine would completely flip out, lock up, and my speakers would emit this eerie srcatch noise as if something in my computer were yelling from the grave. So, I updated all of my drivers and made sure everythingwas up to date. I started monitoring the temperatures and noticed that my chipset temperature was hovering around 50 Celcius IDLE. It was hitting around 57 full load. This was scary.... and I figured something was wrong there. I have two 7900gtx cards in there surrounding the chipset on a DFI Lanparty UT SLI-DR Expert. I thought that maybe the water cooling unit I had on it (Zalman Reserator cooling... northbridge water block) wasn't sitting correctly, so I re-installed it and used some arctic silver to boot. No decrease in temperature. I re-routed the water cooling to hit the northbridge first... still no improvement. I do have water cooling going through both GPUs, the chipset, and the CPU. The graphics cards are running around 42 degrees, which is normal, the CPU is running at 32 idle and 38 loaded. Anyways, after rerouting, I decided to reinstall windows and all the drivers, but promptly ran into the problem in my title. I can't even get into the BIOS!!!! I started unplugging devices from the mobo to see if I could isolate the problem, after unplugging the GPUs, nothing... after the DVD drives... nothing. Then, I unplugged the SATA HDs, finally something loads on my screen. I get into the BIOS and check out what's going on. Everything looks normal. So, I start plugging things back except for the HDs. Nothing loads this time. Then I unplug everything just like I had before, NOTHING!!!! Now nothing loads up at all, I've tried clearing the CMOS, I've tried safe boot, and tried unplugging everything imaginable from the motherboard. Does anyone have any suggestions? Is my motherboard dead? It was working just fine before! Any help is much appreciated! I'll leave you with the main specs on my machine:

DFI LanParty UT SLI-DR Expert
X2 4800+
XFX Extreme 7900GTX (SLI)
OCZ Platinum 2 gig memory
Enermax Liberty 620w
WD 150 Raptor
WD 500 Caviar SE16 (2)
X-fi platinum

Thanks in at advance.

 

[Proprioceptive]

I hate to bump this so quickly, but the sooner I find a solution, the better. Thanks!

 

[BOLt]

A dead motherboard may very well be the culprit. Sorry to break your balls. On a side note, you've got the pimpest computer that I've ever seen, if that makes you feel any better. May I ask how much it cost?

 

[Proprioceptive]

Originally posted by: BOLt
A dead motherboard may very well be the culprit. Sorry to break your balls. On a side note, you've got the pimpest computer that I've ever seen, if that makes you feel any better. May I ask how much it cost?

Haha... thanks for the compliment. Full system specs in my sig. The whole system cost me about $5400 (including software and peripherals)