Time Machine won't use existing backup
I just got my Macbook Pro back from being repaired today, but am now having trouble getting it to continue using the Time Machine backup I have on my Time Capsule. When I tried to do a backup, it failed, saying that the backup volume could not be found. Entering Time Machine would only show me "Now", rather than all my backup history. So I went to Time Machine Preferences and used Changed Disk to set it to use the Time Capsule. However, it now begins to create an entirely new backup. The .sparsebundle file from my old backup is still on the Time Capsule, I just can't seem to get Time Machine to use it.
Does anyone know how I can get Time Machine to continue using my old backup?
2.2Ghz Macbook Pro, 160GB HD, 4GB Ram
16GB iPod Touch