I just did the EMI Firmware update for my 20" Intel iMac last night without a problem. My normal sleep procedures include logging out first. I logged out and told the unit to sleep earlier this afternoon. I came back tonight and found that the system did not go to sleep but froze midway in the sleep procedure. After a successful hard shutdown and reboot, I tried the procedure again and the system went to sleep as normal. Would this be considered a one time anomaly or did something go goofy in the firmware update? I have had this unit for a month without a problem. Thanks.