My Macbook Pro boots to a blue/grey screen then shuts off... HELP?

I'm running a mid-2009 Macbook Pro with Snow Leopard.
It had been running fine until a few days ago until it randomly started running extremely slow. A friend of mine suggested to hold Command + S while booting up, then running /sbin/fsck -fy to repair the disk; however, it would never repair regardless of how many times I've tried. Now when I go to boot up, it goes to the blue/grey screen with the Apple logo and then shuts down. I don't have the OS disk, nor does my disk drive work.
Is there a way to fix this, or is it doomed forever?
Thanks!

You need to get hold of a Snow Leopard disk. Give Apple customer service a call and have them send you a Snow Leopard retail disk. It will cost $29.99 plus some sales tax and shipping. After you receive the disk, change out your defective hard drive and re-load Snow Leopard. If you have not been making backups, you may have lost all your data and apps.