I have ubuntu 11.10 64bit, can't shutdown or restart my pc?

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http://askubuntu.com – I have ubuntu 11.10 64bit, everything worked fine but after i uninstalled the airtime dj app i can't restart or shutdown my pc !! The only way to reach at the screen showing that system is going to shutdown is via terminal but it stucks and never shuts down ! I can't even restart it ! I can suspend my pc fine but can't shutdown or restart it. Need to keep the power button pressed for a long time to shut it down ! Do i have to look for a shutdown script and find out what is happening ?? I'm very unhappy with this it gives to my nerves. (HowTos)