I had Ubuntu 11.04 previously it was running good,
but yesterday there are few problems like the top right corners volume,date,log out,etc options are gone,
then when i clicked on "system testing" it wasn't responding(i mean no result),
and after some time when i tried to restart there wasn't any movement of mouse system was hanged,
then I restarted from CPU(by pressing the button) then there was nothing only black screen and cursor.
what is the problem with my ubuntu,
now what i have can do is there any solution.
thank you for your time.