I had checking battery state hanging

I solved it with the help of an answer from this site:

sudo apt-get --reinstall install gnome-power-manager

But now my left windows bar is rigid, it does not disappear on wide screen.

EDIT

Also in most of applications, characters are white.

What could be the problem? and what should I do?

2ND EDIT

My ubuntu is 12.04 LTS.

I was trying to install some packages for dependencies of allegro game development library, one of the packages was libwxgtk2.8-0, after that a red cross appeared near user name and clock.

Then computer became frozen and i had to remove my battery. I know it is a very bad thing.

Then when i try to restart my computer, it could not start, it was waiting on black screen with line: Checking battery state...

Then i run the above command.

Computer could start but characters are white.