I Just upgraded to mountain lion os x to 10.8.1 and I have a problem with restart my computer

I Just upgraded to mountain lion os x to 10.8.1 and I have a problem with restart my computer.
Now my computer is stuk on restart and wont turn on.
Can somone help me with it?
Thanks.

If Mende 1's suggestion doesn't solve it you might find the following useful:
I would first reset the SMC:
Shut down and unplug the Mac.
Keep the Mac unplugged for at least fifteen seconds.
Plug the Mac back in and do not turn it back on for at least five seconds.
Press the power button to turn the Mac back on.
Then I would reset the PRAM by rebooting the iMac while simultaneously holding the Command-Option-P-R keys until the machine restarts a second time.
Hope this helps

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