I downloaded the Halo demo a few days ago, played it and absolutely loved it. In fact I ordered a copy just yesterday. I tried launching the demo today, and it refuses to open - it shows the "HALO" loading screen for a second and then just quits. I've tried everything I can think of (trashing the prefs, repairing permissions, restarting, etc.) and nothing fixes it. I don't get why, it ran just fine yesterday. The hardware/software I'm using is the following: iMac G5 20" 2Ghz 512MB RAM 250GB HD ATI Radeon 9600 128MB Mac OS X 10.4.2 Halo Demo 1.5.2 What's wrong here? Any insight greatly appreciated.