Macbook Pro won't start? kernel panic every time

Question

I am having a problem even the people at the genius bar cannot solve.
I took it in the other day, and the diagnostics run by the employee could not find anything wrong with my hardware, yet whenever I attempt to start it up, it produces a kernel panic. Until today I could not get the computer to even get past the grey loading apple screen.
Here is what I know so far:
-2.2 ghz processor intel mac from mid 2008-2009
-running version 10.5.8 os x
- I have run it in single user mode, and typed in fsck -fy and a pcsd.pub problem occurs, saying I have the wrong block count (16 instead of 17). After running it in this mode, it says it is repaired, but I am not convinced, as it has frozen on me (while the screen flickers constantly) if i try to repair the disk.
does anybody have any guesses?
what is the next thing I can do from home?

Answer 1

Your hard disk's directory structure is corrupt. Disk Utility may be able to repair it to the extent that you will be able to mount the volume for the purposes of extracting your data should you not already have a backup, but that will not change the fact that the hard disk has already failed and requires replacement.
Erasing and the disk and reinstalling OS X may work for a while but the problem is certain to return.
The Apple Store can replace the HD for a reasonable fee, or you can do it yourself.