Time Machine Won't Continue Old Backup

My computer was being repaired at Apple for a few weeks and I just got it back. No hard drive data was modified during the repair; the optical drive needed work. Anyway, I plugged in my external hard drive a few moments ago and it's backing up the whole system and won't let me return to the previous backups that I already have. I'm trying to recall a few files and Time Machine won't let me find them even though they're on the external drive. I did, however, accidentally rename the external hard drive when I was using it without Time Machine a few days ago.
Is there a way for me to continue where I left off with my old Time Machine backups? I'd hate to lose them all and I don't want to re-install the entire system from a previous one from a month or so ago; I just need to look at a few old files. Thanks for any help!
Greg

So, here's what happened.
Time Machine uses the xattr system to assign specific folders hidden attributes. Time Machine sets each folder up in its hierarchy with a xattr tag for the Ethernet MAC address of the machine it is backing up. This is all done invisibly. So, when I got a logic board, and a new MAC address, it wouldn't treat the old archive as concomitant with the new machine. So, here's how you fix this:
- remove the ACLs from the Time Machine DB
- use the xattr command at Terminal to put your new MAC address on the folder.
Full details are available here:
http://www.tombridge.com/rta/2008/01/after-the-apple.html

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