Just over a month after releasing a graphical update for the 27 ″ iMacs, today Apple has released yet another update, designed for the screen of all-in-one desktops. The purpose of this to correct problems of flickering that in some units nothing has been said about yellowed screens, however.
The 27-inch iMac Display Firmware Update 1.0 weighs 294KB and can be downloaded here. Complete instructions on how to update your computer with it can be found in this support article.
Graphics problems with the 27-inch iMac appear to be the cause for the alleged suspension of desktop sales, and Apple's internal documents have already recognized a more serious problem that is occurring with this desktop model.