Time Machine no longer working on Macbook Pro

I am at my wits end, have 2 Macbook Pro'sand one no longer backups up in TM (simply spins forever in 'Preparing Files'). I upgraded to Snow Leopard, which exposed the bad disk, and had both the disk replaced and OS re-installed. Still no luck, it simply spins for days. My other Macbook Pro backs up flawlessly every day on the same wireless network. Apple does not seem to know what the problem is, I tried renaming the machine to no avail. Any ideas on what to try next???

Sometimes there is no answer to the "preparing" issue other than deleting the backups for that computer and starting over with a new backup. But, before that there are several steps that can and should be taken.
It would be a good idea to first use Disk Utility to check the hard drive on the MacBook Pro that is giving you problems.
Open Hard Drive > Applications > Utilities > Disk Utility
On the left, click the exact name of your hard drive as it appears on your desktop.
Click Repair Permissions
The process will take approximately 30-90 minutes depending on how much data you have on your computer.
Once completed, try a backup again. Be ready to let "preparing" run for a few hours. If no progress after 4 hours, then stop the process and we'll try some more steps.

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