Cannot startup my Macbook

Hello all!
I am having trouble starting up my 2 year old Macbook. While using it, it went into sleep mode as appropriate. Then I treied to use it and it became non-responsive so I forced shut it down. Since then I cannot startup the Macbook. Everytime it is turned on it gets stuck on the grey screen with the apple in the background and the circular timer. Then after about 2 mins it shuts down automatically. I have tried many things. Start just from the battery, just from power cord with battery out. I have reset the PRAM. I loaded from the OS X disc and ran hardware and hardisk utilities and they found no problems.
I don't know if this is helpful but when I listen to the harddrive closely when it is at the grey screen, the sound is repetitive like it is stuck???
What are my options from here?? I do have a large amount of data I would like to not lose on the HD. Thanks.

Hi and welcome to the Apple Discussions.
I suggest backing up your HD before doing anything else since you do have a lot of info in there. If you have another apple computer, do a target disk mode (connect both computers via firewire and turn on the macbook while holding the T key). This will allow you browse the contents of your HD on the other computer and do a backup. If that is not an option, then boot your computer from the install disk and do an Archive and Install make sure you preserve user and network settings. This will reinstall the OS without erasing any of your personal files. Good luck.

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Cannot startup my Macbook

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