OS X won't start - help

I have a 4 month old MacBook Pro, and this last week a weird problem came up. The computer was asleep, and when I woke it up, everything was frozen except for the mouse. I couldn't click on the Apple menu to select shut down or restart, so I used the power button. Upon restarting, it would shut down shortly after the OS X load screen appeared. I took it to the tech repair guy for my department at school, and he found 6 corrupt files on the hard drive. He replaced those files (I'm not exactly sure what they were) and rebooted, and my computer was fine with all my files still there.
However, today the same problem happened (it was fixed on Friday). I have tried unsuccessfully to boot in Safe Mode, and when I use the disk utility, it will start and then abort. It says
"Invalid record count" "Volume check failed" "Error: The underlying task reported failure on exit."
I also tried to reinstall OS X, but it wouldn't recognize a drive to install it on.
Does anyone have any ideas on this?
MacBook Pro

What do you mean by safe mode is single user mode? ("apple+s" combination?)
There may be a hardware failure on your harddisk. Can you boot from your install DVD? Try that, run Disk Utility, and check the entire disk for errors (click repair disk).

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OS X won't start - help

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