New system stopped booting

[{EB}NuTSymPToM{EB}]

Hi all. I built my new rig about 2 weeks ago and its been running perfectly until today. I try to boot it this morning and I get no post beep and no video signal to my monitor. It powers up, fans spin, drives spin and then it just switches off after 15-60 seconds.

I've disconnected/reconnected everything and even booting with no memory in it I get no beeps.

System specs:
Asus P5N32-E mobo
Intel E6750 at 2.66ghz
EVGA 8800GT 512mb
2x 1gb Corsair Dominator pc8500
700 watt Thermaltake psu
320gb Seagate 7200rpm SATA HD
Lite-On DVDRW, Lite-On DVD drive

This is my first post college build and I haven't done one since I first went to school 4+ years ago so I don't have spare parts to test this with. I'm really not sure what the issue is though I'm leaning towards the mobo right now. Any ideas? Anyone seen anything like this before?

 

[{EB}NuTSymPToM{EB}]

Just an update. After lots of research and trying different solutions I'm worked all the way down to just the mobo with NOTHING but the cpu and psu connected to it. I get no beeps regarding no memory installed.

I've found alot of similar threads about my mobo so I'm just assuming its taken a dump. I think I'm going to put in for an RMA if I don't find anything definitive tonight.

 

[{EB}NuTSymPToM{EB}]

Am I correct in assuming that if I get no beeps with nothing but cpu and psu connected to the motherboard its almost certainly a dead motherboard?

I suppose it could be the cpu but it ran flawless since I built it.

If I try the new motherboard and it doesn't work I guess I'll RMA the psu and cpu too.