Obviously the iMac is one of the most problematic since the day from it’s launch. Apple continuously releasing patches for it. Apple has released two new fix for 27-inch model of iMac. 27 “iMac EFI Update 1.0 FW is used to troubleshoot processor utilization while playing audio through the headphone jack, and arranges an impact on the backlight of the monitor. Another patch is to fix problems of compatibility when using the iMac 27 “as a second monitor.