Linking previous Time Machine Backup to a new Mac OS X Reinstall

Hi guys,
Several recurring problems prompted me to reinstall Mac OS X Leopard 10.5. Beforehand, I had made a copy/clone of my entire Macintosh HD onto an external hard drive. After the reinstallation, I selectively copied specific folders back to my fresh installation.
On my previous installation, I have had Time Machine running for several months. Trouble is, when I connect the external hard drive which holds the Time Machine backups, the Mac does not recognize it.
I wish to have my new reinstalled Mac back up to this same Time Machine backup. I have copied all of my documents and applications back onto my new installation. I wish to browse previous backups of the files I had made.
Correct me if I am wrong, but I believe if I choose my old Time Machine hard drive as my Time Machine backup disk in my new installation, Time Machine simply starts an entirely new backup and ignores the old Time Machine backups made from my previous installation.
I would appreciate any help you guys could provide.
Many thanks.

I had that problem and a more challenging one as well - don't feel bad, mine was caused by the Apple geniuses at my local Apple store doing the same backup and reinstall OS thing.
One thing to be sure of - go to the "SHARING" pane in System Preferences, and be sure that there is a name for your computer in the appropriate box - AND that the name is the same one you were using before your re-install. Mine had been changed, and when I fixed that, TM recognized the TimeCapsule drive. However - another more difficult problem persists. Here's a message I posted on another thread dealing with the "other" problem: TM won't show the backups made prior to my reinstall (except under special circumstances, noted in the message).
have an almost identical problem. yesterday I picked up my MacBookPro from the Geniuses at my local Apple retail store. In order to fix a problem with QuickTime, they ported all my files to a backup disk, reformatted my HD, installed a clean copy of OS X 10.5, upgraded it to the current version, then copied my files back to my computer's HD. They messed up my password; somehow made many of my applications vanish (I've mostly fixed those problems now) AND I can no longer access the backup files saved prior to their "help".
One wrinkle - I can see all of the backups in the TimeMachine window if I am at the level of my hard drive, OR clicked on the applications folder. If I select any other subfolders, the pre-"help" backup files gray out and cannot be used. If I move to a pre-"help" backup file while at the HD level, all but the applications folder are grayed out and non-responsive to clicks
I ran DiskUtility - repair permissions - and while it found a huge number of things to fix, this did nothing for my Time Machine problem.

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