I was having the same problem and Apple told me to connect via USB NOT Firewire 400. I guess Snow Leopard is no longer compatible with older firewire 400 devices. Anyway, it worked but after printing 1 job I got an error message about parts having lived there service life. Basically referring to replacing the ink pads. My work around (probably not the best solution) was to reset the ink pad counter. It took forever to figure out how because Epson does not supply a utility for the Mac only PC. But if you do this you don't need a utility to reset the ink pad counter. I found it at this site.
http://www.weink.com/Support/html_whitepapers/tsn21.htm
Epson Stylus Photo 2200
1. Turn off the printer power and unplug the power cord from the wall. Disconnect the computer interface cable at the back of the printer.
2. After one minute reattach the power plug to the wall, but don't reattach the computer cable.
3. Hold down the ROLL and the PAPER ADVANCE buttons simultaneously.
4. Turn the printer on. after 2 blinks, all the ink lights come on, then release the buttons being held down.
5. Press and hold the ROLL button for 10 seconds.
6. Release the ROLL button and the printer will initialize, which resets the Waste Ink Pad Counter.
7. Once initialization is complete, turn the printer power off.
8. Reconnect the interface cable.
9. Turn the printer on and print a document.