Alright, I'm new to this whole mac thing so this question will sound scrubby, but I have a Mac OS X 10.5.8. I've been reading all throughout these boards and it appears my mac can run as graphically demanding games and better(as l4d2). But when I try to run L4d2 it says, "You must be running MacOS 10.6.4 w/ apple's snow leopard graphics update or later to run this game." I've done all the updates etc etc, but I just don't know what this means. Am I missing something? Or am I just hosed? Thanks!