Mac won't startup

[mdc31997]

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I turned on my Mac, and it gets stuck at the apple logo with the spinning wheel. I reset the PRAM and NVRAM. I ran "/sbin/fsck -fy" and it just gives me errors. "Incorrect block count for SystemEntropyCache should be 1 instead of 0 Unable to fix Macintosh HD the file system was modified". I don't know what to do. Help!!

 

[rdowns]

Try booting off the DVD that came with the system, run Disk Utility from there and see if it can fix the problem.

 

[mdc31997]

Wirelessly posted (Mozilla/5.0 (iPod; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A5313e Safari/7534.48.3)

I did, and it says that the disk cannot be repaired. I am out of warranty, so does that mean I have to buy a new one? I don't want to!