I'm running a mac w/osx 10.4.11 on a 1.5ghz power PC g4. It also does not work/show up on my mac pro dual 2.7 g5 ( I think that has the same OS). Also, it didn't work on my friends mac laptop (not sure what model, but he's much more of a programmer tech person and HE was stumped. So, I'm a bit mystified at this point. The error message I get is this:
avrdude: stk500_getsync(): not in sync: resp=0x86
avrdude: stk500_recv(): programmer is not responding
although the TX and RX lights come on on the board.
Any help/suggestions would be GREATLY appreciated.