Newly built system won't boot

I have recently built a computer using parts that arrived yesterday. Once the motherboard, CPU, RAM, and PSU were ready, I tried to get a post, and guess what, NOTHING! YAY! The computer turns on, pretty lights everywhere, nothing on the monitor, and after a few seconds, it'll shut down for like 5 seconds, then turn back on again yielding the same results... I have tested the power supply and it does work with my other computers, and removing the RAM produces the same results, so (I'm guessing) they aren't the cause of this problem.Thus, it's either the CPU or Motherboard... Can sum1 tell me how to figure out which one is DOA? It's my first LGA 1155 system, so I don't have spare parts to test them with...

Mobo: ASUS P8Z68-V
CPU: Intel Core i7 2600K
RAM: 8 GB (2x4 GB) DDR3 1600 MHz
PSU: Thermaltake 800W
Other parts: You probably don't care since they obviously aren't the cause
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More about newly built system boot
  1. Run through this guide and the bread boarding linked to in the guide
  2. well I pretty much have that all covered and my speaker produces no beeps, so i'm inclined to think it's my motherboard. Anyone have any other advice? If not, I'll just RMA both
  3. Usually if no beeps with a speaker installed then it is the motherboard!
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