Circular boot on new build

[MEC]

Ok, so I just put together a system:

GA-P55-UD4P
i5
4gb DDR3 RAM in 2 DIMM
asus video card

When I try to power up, the fans start spinning and the lights on the motherboard light up. After about 5 seconds, it all stops and reboots. There is no beeping. I tried booting with each stick of RAM individually with no change. The processor seems to be seated well with no damage.

Any ideas?

 

[nekko]

Read here: http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems

 

[MEC]

Ok, so on the list of 20 things, all seemed ok. When I pull out the RAM and boot, the same thing happens. No beeps.

According to the other post this indicates either a bad PSU, Motherboard, or CPU. Is there a way to narrow down what the problem is? I have no other parts to use and am a novice. Should I just send parts back and have them replaced? Everything looks physically undamaged.

Thanks.

 

[MEC]

I also just noticed that when the system reboots the fan in the PSU shuts off as well. Would this indicate a problem with the PSU, or would that happen regardless?