Hey All, Just got a brand spanking new base model iMac 21.5" and just love it. Except that it keeps locking up. It has happened 6 or 8 times in the week I've had it and -- if I remember correctly -- every incident was related to quitting an iLife application. Just now with Garageband. Everything stops, pointer won't move -- has happened with both magic mouse and trackpad -- Force Quit yields no response. Powering down is the only solution. Any help would be much appreciated. Thank you advance!