Using the same external drive with Time Machine on new mac?

I recently got a new mac because my old one broke. Thankfully, I had a fresh backup on Time Machine ready to restore onto my new computer. But when I try to use Time Machine with my new computer, it keeps wanting to do a whole new backup. It won't recognize the latest backup to only add new or changed files.
Here's a breakdown of my events:
new computer
restore Time Machine on new computer at install
want to continue using the external drive with Time Machine from where I left off (only adding new files since the last backup) on my new computer
Time Machine wants to do a whole new backup
Question: How can I continue to use my existing external hard drive with Time Machine on my new computer, picking up where I left off (not a new, complete backup)?
My old computer was Snow Lepoard, my new one is Lion.

Bergers wrote:
new computer
restore Time Machine on new computer at install
That should have left a "trail" in your SystemMigration log, so Time Machine can figure out what happened and automatically "inherit" the old backups.  But sometimes, obviously, that doesn't work.
Since it didn't, there's a chance you can do it manually.  See #B6 in Time Machine - Troubleshooting.

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