Scattered reports around the Web indicate that there may be one or more design flaws with Apple's 27" Core i7-powered iMac. Many users claim that their high-end iMac systems have cracked screens out of the box, and some units are completely dead on arrival. Among the affected are Thankfully, Apple is replacing all cracked or otherwise defective iMacs free of charge. As noted by Engadget, if you plan to give someone an iMac for the holiday, you may want to test the system prior to gifting.