During the closing days of 2009, Apple released a firmware patch that was supposed to fix display issues with its 27-inch iMac systems. According to users, that patch didn't work. Apple has now taken a second stab at the problem, releasing a new firmware update.
Here's the official word from Apple:
The 27-inch iMac Display Firmware Update 1.0 updates the display firmware on 27-inch iMac computers to address issues that may cause intermittent display flickering.
According to users affected, the problems with the 27-inch iMacs range from screen flickering and changes to brightness. These aren't the only issues affecting the 27-inch iMac, but Apple's not being so proactive in fixing those, seemingly going as far as to try to bury the problem.
I'd like to hear from 27-inch iMac owners to see if this fixes the issue or not.