Today Apple posted 27-inch iMac Display Firmware Update 1.0, which targets the display itself rather than the graphic hardware. The official release notes say this update is intended to fix “intermittent display flickering”, a common complaint with the new machines.

In addition to the new firmware update, Hardmac is running a story that cites unnamed sources, who claim Apple has actually stopped production of the core i5 and i7 versions of the 27″ iMac model.

Users posting in the Apple support forum say that previously ordered iMacs are still shipping.

Apple previously issued a 27-inch iMac Graphics Firmware Update 1.0 intended to fix “image corruption or display flickering” on machines with an ATI Radeon HD 4670 or 4850 chipset.