I put my MacBook Pro to sleep at night and the next morning when I try to boot it .. I get a question mark icon on a blinking folder... I long press the power to shut it down.
After some time when I try to boot again I no longer see the same error icon, instead i see the Apple icon followed by the user accounts (one main account and the other for the guest user). After keying in the password the OS seems to load as I can see on the progress bar. But then it stops and there is a blank screen with a prohibited sign on it.
This is what I have tried so far.
I have gone to the Disk Utility window and I have tried to verify the disk and the results tell me that it is corrupted and needs to be repaired. But the repair disk button is disabled. Also i am able to boot using the guest user account just fine. Can someone please help me out?