Folks, I've been using PC all my life, and we recently went all mac in the house for ease of NO issues Never looked back since! However in the troubleshooting game, im a tad off.... So my Wife's iMac, a few days ago, wouldn't wake up from sleep, I had to hold the power down on it, and restart it. Everything came up fine. Last night, we got home, and u know when ur watching a video, and it freezes but keeps replaying like .01second of sound blasting really loud? It was doing that, was frozen, and wouldn't wake from sleep. How can i troubleshoot this? I found the log files, in the /var/log folder...i seen when i restarted the computer, a bunch of stuff came in the 2 log files i looked into. but provided no info as to what app, or if hardware failed. I did recently see a KB article, http://support.apple.com/kb/TS5167?viewlocale=en_US&locale=en_US that advised of video issues, but i have the 21.5" iMac..... If anything like a PC, when in sleep, i don't think an application would cause such issue, would it? Thanks for any help u can provide!