Boot Issues - Antec Kuhler 620

Hello everyone,

I built my system about a year ago and it has been working fantastically but I recently wanted to overclock my i7 960, so I replaced my stock cooler with the Antec Kuhler 620. Since then my system has issues booting where it will turn on for 3 seconds, not post, and then shut down. It does this 3 times in a row and then turns on like normal. I thought it was a thermal shut down because I messed up the thermal paste on the initial installation, but I bought a tube and reapplied (what I thought) was successfully but still the same issues.

What's going on?