2007 MBP won't get past grey loading screen

I had been using my MBP running Snow Leopard to play movies and music through a TV/stereo and brought it with me when I moved to do the same, but now it won't start it.  I kept it asleep as I brought it on the plane, then when I got to my new apartment, it was frozen.  I shut it down, then tried to turn it back on but it get stuck in the grey loading screen with the Apple logo.
I've tried starting in safe mode (it will bring up the safe mode loading bar, then that disappears and it gets stuck on the normal gray loading screen).
I've also tried resetting the SMC and NVRAM. 
Then, I tried to start it up from a friend's OS X install disk (but it came with his MacBook from the same era, so idk if it only works for MB and not MBP), but that doesn't work either (selected it as the startup disk by holding Option when booting up, then selecting it.  It then goes to what it does normally except it will turn itself off instead of gettting stuck.)
I don't know what else to do.  I'm assuming something is seriously broken.  I'm hoping it might just need a reinstall or maybe a new hard drive, which I could do if it's not too expensive.  Thanks for any help or ideas of what I could try next!

I tried this from another post:
Boot holding down Apple/S and don't let go until you see scrolling text.
When that stops and you see a root#: prompt enter
fsck -fy
Let it run through all the checks and repairs.
If it fails first time, at any time, or finds and fixes a fault - run the command again and keep doing so (some fixes can take several passes) until it says "Appears to be OK" then enter
But when "Checking catalog file" it says
disk0s2: I/O error. 
Invalid node structure
(4, 3620)
The volume Internal could not be verified completely.
/dev/rdisk0s2 (hfs) EXITED WITH SIGNAL 8
Tried this again, but same thing over again a few times.
I'm now guessing my HD is dead.

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