Hi all, I've had a 21.5" iMac since Dec. 2009. Just recently I've found that when the computer has been idle for ~3 hours (i've turned sleep off), iTunes will not start and Flash movies/games will not play in any browser (Safari, Chrome, Firefox). Upon rebooting, everything works great... but after about 3 hours of idle time, it won't work again. Please help! Chris PS- I've tried uninstalling/reinstalling ALL Adobe software, all browsers, and iTunes.