Hi All, I'm highly mac illiterate so please bear with me! I have a late '09 I5 quad core iMac which lately has been slowing up with the beachball consistantly appearing for minutes at a time with even just itunes or safari open. Then it froze up one night and (not knowing what else to do) I held the power button in until it shut down, waited 30 sec and rebooted only to have a blue screen appear and nothing else. Finally I unplugged the power supply and rebooted and everything seemed fine. I took it to the Genuis Bar and he said everything was working. SO, I went ahead and ordered 8g more of ram from Macsales.com to give me 12 in total thinking maybe that was the issue. Then just today, the magic mouse randomly froze on my screen and after 20 min of trying to reboot with the keyboard, I again had to manually power down and reboot. I even replaced the batteries in the mouse before shutting it down. Is anything wrong? All I've installed is MS Office, a Big Bird game, and Handbrake, all which have been on the machine for months! Sorry for the long post but I'm quite freaked out at the moment.