12-13-2012 01:04 PM
Well, that is terribly sparse on details from which to provide anything useful. Is there anything specific that it does? Any error messages? Any hints at all?
Lacking details, here are a few guesses...
I recommend that you attempt to boot into Safe Mode:
It may take you multiple attempts to get the ESC key sequence (press/release/hold) correct, so be patient. When successfully into Safe Mode, think carefully...what happened just before this behavior started? A new app? An update? A Theme? Something else? Think carefully as the smallest change could be causal...and attempt to undo whatever that was.
You may also want to try this procedure to perhaps narrow down the precise causal item:
When the behavior presents, you know the culprit...the last thing you loaded.
If the behavior does not re-present, then you know that either step 1 or 2 cured it.
If the behavior presents no matter what, then you likely have a hardware level issue for which no amount of OS or software can cure.
Good luck and let us know!