Apple is putting a temporary stop to the production of 27-inch iMacs, a "well-informed" source claims. The interruption is expected to affect both Core i5- and i7-based systems, and hold until Apple has fixed problems causing yellow-tinted video, as well as other graphics issues. The company is allegedly telling some customers that it cannot honor earlier delivery times. Nevertheless, the US Apple Store and storefronts in other countries are still listing three-week shipping delays.