Can't boot into OSX from different Hard Drive

Hi,
I am having a problem booting into OSX.
I put my own HDD into my Macbook when I first got it and everything was fine, no problems. But recently I took it out to keep my data safe and put back in the old HDD and reinstall OSX Snow Leopard onto the old HDD. After this completed I put back the one I had purchased myself but upon starting the laptop a bar appeared at the bottom of the Apple startup logo and after disappearing the system did not get any further.
I put my my Snow Leopard CD after this to repair and check the disk and then came the errors that It was corrupt and could not be repaired and that I should try to back up as much data as possible.
My question is, is there anyway to boot from this HDD again without reformatting it? and if I do have to reformat it, can I place it into an enclosure to get the data off?
The HDD was working perfectly with no reported errors until I put in the old HDD and made a new installation on it.
Thanks for any help,
Francis

After looking for answers and phoning Apple I have ended up having to reformat. For those who also have this problem:
I have heard that running Disk Repair multiple times works, try booting into safe mode and try fsck in single user mode. My solution was just to connect the hard drive via USB so I could at least get all my data off of it.
Cheers,
Frank

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Message was edited by: Fortuny

Can't boot into OSX from different Hard Drive

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