(Z77A-G45) HELP! Computer shut down while working and... never boot up again

Assembled the other day but...today it was working fine. Sudenly shut down and never boot up again.
(Z77A-G45 thunderbolt)
i5-3330 3GHz
gpu gigabyte gtx560
Ram 2x4G (High-performance 8GB Vengeance Dual Channel Kit, 1600MHz, 9-9-9-24, 1.5V)
psu Silencer MkII 750W
Any thoughts?
Thanks

Voltage at 24 pin and 8 pin connectors are ok and under the tolerance as I saw here http://pcsupport.about.com/od/insidethepc/a/power-supply-voltage-tolerance.htm
I will check the other rails.
Hmmm... starting to suspect that the cause is something else.
Missed the beeps in the past.
This mobo (z77a-g45) never emitted a single one.
Not even at startup when it was ok!
Oh man!
The computer was running well and then suddenly screen went black, no disks activity, no keyboard response, no video, no reset switch working. Fans continue spinning.
Had to pull the plug to stop the fans. Then plug it again but no boot. Just cpu phase led 1 is lit, fans activity and nothing more. No welcome screen, no disks activity!
I will try to test the ram on another computer.
Any other clues?
Thkx

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    Quote
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