Computer not booting, cannot access BIOS

Motherboard: Gigabyte P965 DS3, Rev 3.3
Processor: Xeon 3060
RAM: 2GB (2X1GB) WINTEC AMPX DDR2-800 (1.8V)
PSU: Antec PowerTrio 650W

My computer was working as of Friday night, when I took it home from a LAN party. When I returned home and hooked everything back up, the computer refused to boot. I couldn't even access the BIOS, as there was no graphical output. The computer began a restart cycle, ad infinitum.

I have not been overclocking. I have not flashed the BIOS.

Restart Cycle (Occurs in a regular pattern. Timing is always exactly the same.)
1. Fans turn on, LEDs turn on. (GPU fan only spins around twice, if plugged in.)
2. Power continues for a second or two.
3. The power shuts off, LEDs turn off, fans slow to a halt.
4. Repeat until power is pulled.
5. If the PSU is switched off, there is a slight flicker when it tries to loop. The flicker is only enough to spin the fan once.

There is no beep error or anything during this.

I've tried the following.
1. Tried with only CPU and RAM.
2. Tried with only CPU. (This resulting in a beep error for no RAM, but the reboot cycle still occurred.)
3. Reseating the CPU and heatsink.
4. Tried with each stick of RAM individually.
5. Just for grins, tried with everything in.


Is this related the cold boot problems associated with the P965 DS3s?
I'm just trying to get an idea of what could be wrong. Power supply? The CPU? The RAM? The motherboard itself (Heaven forbid)? Could something have jostled in transport and I'm shorting it somewhere?

Do you have another PSU you could try? It almost sounds like it doesn't know what to do... wrong voltages would make it not boot, but it should shut off, not restart. At your LAN party, did you have it plugged into a surge protector? Is it possible a surge hit between the time you turned it off and the time you unplugged it?

Thats where I'd start. Good luck, mate.

As stated above resetting the bios also remove the battery leave it out for about 30 min or so. sometimes it takes a while for it to discharge. Yes i would also try another psu or try the cpu/ram in another mobo if possible. Just make sure every thing is fully connected on the motherboard also IE the 24 pin power and the cpu power connectors. they may have got loose in transit.

Alright, I'll try clearing the CMOS.
I've already removed the cooler, reseated the CPU, cleaned them, and reapplied the thermal paste, in case something there got bumped in transit.
Tried the wiring already, could try again.
I'll see if I can scrounge up another PSU.