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I just did a fresh install of Ubuntu 14.04 and all works fine until I update the Nvidia drivers: the update apparently goes ok but when i reboot the machine it crashes after the Grub's window.

If i chose the first option (ubuntu genereic kernel.....) by hitting enter, the system crashes after few second, as if I had unplugged the power cord.

The weirdest thing is that I am unable to restart the computer from the on/off button, to restart it I have to unplug the power cable, wait about 10 seconds then I can restart it (just to see it crashing again).

What should I do? at the moment i can only acces the pc with a live cd! (and works fine)

my computer: ubuntu 14.04 64bit, amd eight core, 16GB ram, Nvidia GTX560.

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