Mac Photoshop cs2 twain plugin/drivers

This is driving me freaking nuts.  I recently did an HDD swap for a client on a dead drive for an intel based iMac (which is always fun tearing apart).

Anywho, I replaced the exact version of photoshop on his machine, 9.0 (cs2), and his OS is 10.6.8 (snow leopard).

He's used to be able to take his scanner (epson perfection 610) and directly import a scan into photoshop by opening photo cs2, selecting file, then import, then it would give his scanner model in the list (I'm assuming using the twain driver).  Now, we haven't changed any software, or any versions, same OS version, same scanner, same photoshop version.

We installed CS2, then loaded the most up to date drivers for the scanner (twain driver included in the pack), but whenever we boot up cs2, import does not contain any scanner/twain options.

Where to go from here??