Currently Being ModeratedJan 9, 2013 5:11 AM (in response to Jeetpathak)
I suggest that you press and hold the option key whilst restarting your Mac.
Then select the recovery partition.
When it boots, choose disk utility, and verify your hard disk (Macintosh HD or whatever you have renamed it to).
Currently Being ModeratedJan 11, 2013 10:38 PM (in response to RodneyW)
Thanks RodneyW!! My mac was on so I went directly to disk utility and verified the hard disk though it didn't ask me to repair the disk. Since then its been working fine. Thanks!