I am unable to recover from this problem.
I installed fedora 12 .It was working fine for a week.
Suddenly it gave an error gnome-power-manager not installed properly(some thing lik ehit)
I read the whole linux forum for this.
I did yum remove gnome-power-manger
yum install gnome-power-manager
Faced the same error could not recover

Then I was asked to remove power-manager completely then I dint face any error
but my system became dummy ! Not showing any thing on the screen , no icons
I was shocked I dint recover even now please help me