Apple releases firmware update addressing 27" iMac screen issues
December 21st, 2009
We hope this will provide holiday relief for many iMac owners: Apple just released a firmware update for the graphics chipsets in 27″ iMac models, intended to fix display issues. Apple states this download
Updates the graphics firmware on ATI Radeon HD 4670 and 4850 graphics cards to address issues that may cause image corruption or display flickering.