New Mac Pro will not start

Hi,
After doing the last update from apple my Mac Pro (late 2013) won't start up.
I installed the update this morning and every thing was working fine. After (ironically enough playing watch dogs) my Mac Pro went to sleep and never woke up. I have fanatically tried everything in my capacity to make it go on again without any result.
The lights in the back goes on but there is no chime or fan noise from the mac. The screens does not go on either.
I have tried to unplug the screens and tried every configuration possible with screens and without. Keyboard and no keyboard.
But the only result I get is the ligths in the back going up, and then down again...
I need help!

I think it is plugged in since the OP said "The lights in the back goes on"
Ho Lee MACkeral wrote:
Have you unplugged the Mac Pro?
You may also wnat to try zapping the PRAM and reset the SMC.

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Grey Screen and spinning wheel at startup
http://support.apple.com/kb/PH11044
Repair Disk
Steps 2 through 8
http://support.apple.com/kb/PH5836
Reinstall OS X
http://support.apple.com/kb/PH10763?viewlocale=en_US
Additional Steps
http://support.apple.com/kb/PH10929

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