I think my HDD is dead - stuck at the grey screen, with the apple logo ..

Hi all,
I think my Mbp's HDD has partially failed. It is the original 100gig drive , which was 95% full.
It started getting incredibly slow so I decided to reboot it. It has not been possible to boot.
I have managed to connect the internal drive to another mac using FireWire and T on startup.
The drive shows up and the data can be accessed albeit slowly.
I tried to repair the drive in disk utility and it came up with a lot of " invalid node structures" and " invalid record counts".
The disk utility seemed to not complete the process so I had to quit it.
I can't boot from the cd , but I may be doing it wrong.
Can anyone help me with the next thing to try?
Thanks.

Slow access even with Target Disk Mode (TDM) can indicate a failing drive, but it's possible that drive can be rehabilitated by continuing to off-load files and keep trying with Disk Utility. Sometimes, enough DU runs can restore sanity.
I'd check the SMART status first (try: SMART Utility at Apple OSX Downloads ). This can be done from the other Mac while the MBP is in TDM. If the drive passes and you can off-load some of the load, then a directory repair utility like DiskWarrior might be worth a try.
However DiskWarrior is US$100 and you can get a new 500GB SATA 2.5" hard drive for less than that. The advantage to disk Warrior is that it's easier to install in an MBP than a new hard drive.

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