661-5576 Apple iMac 27" 3.2GHz Core i3 Backlight Board System Pull. Guaranteed for 90 days. Genuine part. Apple Apple iMac 27" 3.2GHz Core i3 Backlight Board Parts can usually not be interchanged - please check to make sure that your original part has this part number or that the manufacturer recommends this replacement part for your system. Radeon HD 5750 Video Card 1GB GDDR5 SDRAM 27inch iMac Mid 2010 A1312