09-02-2011, 10:02 PM
Maybe there's an OS issue.
Run the Disk Utility, verify the disk and if it doesn't find anything wrong then reinstall the last OS update using the combo updater.
http://support.apple.com/kb/DL1399
Run the Disk Utility, verify the disk and if it doesn't find anything wrong then reinstall the last OS update using the combo updater.
http://support.apple.com/kb/DL1399