Infinite boot loop on Gigabyte H87-n

[albpara]

After trying to install a new cooler for my Gigabyte H87-n (I said trying because it was too big) my computer is not booting anymore... it starts, but after 3 seconds gets rebooted.

I unplugged everything except the RAM and the CPU and I got the same behavior... I tried clearing the CMOS via jumper, removing the battery, using a single RAM slot but it keep rebooting. Nothing is shown on the display and at this point I think that maybe I broke something... but the answer is what?

Anyone has another idea about how to solve this and how to determine what is broken?

I assume that the PSU is fine since the reboot happens always after 3 seconds (more or less) and the CPU should be also fine since was not removed when the problem started (I tried reseating the processor afterwards)

I don't know if technical specs are needed this is what is plugged at this moment:
* MoBo: Gigabyte H87n wifi
* Processor: i7 4770
* 2x8Gb Crucial Balistix DDR3
* PSU: Tacens valeo V 700W

Thanks guys!

Edit: If I remove the CPU it does the exact same thing...

 

[yeti_yeti]

Some thermal paste might have gotten in your cpu socket, i would check it and make sure it's clean. A similar thing happened to a friend of mine

 

[albpara]

Some thermal paste might have gotten in your cpu socket, i would check it and make sure it's clean. A similar thing happened to a friend of mine

Thanks @yeti_yeti

The CPU was not removed when this start to happen, after the error... I check the socket and the CPU just in case and everything looks clean, no dirt, no dust