System not booting up, no video ouput

Riccardo Bestetti

Honorable
Oct 20, 2013
11
0
10,510
Hello.
I recently rebuilt my system with a few new components.
Here's the complete configuration:

(I'm going to mark with an asterisk the new components)
- Corsair Carbide 400R Case
- OCZ ZT Series 750W Modular PSU *
- ASUS Sabertooth P67
- Intel Core i7-2600K
- Corsair H100i liquid cooling kit *
- AMD Radeon HD 6770 (ASUS DirectCU II)
- Corsair Vengeance RAM (4*4GB)

When I press the power button, all the fans (including the one on the VGA) start to spin and the LED on the H100i lights up, but there's no video output (I've tried both VGA and HDMI port).
I can't hear any beeps (however if I remove all the RAM modules I can hear the right sound alarm).

All the components look ok to me, I've already tried various troubleshooting guides without success.

Thank you in advance for your answers!