I'm a long time mac user who is looking to buy an imac. I've been offered a 24" white imac (2.13, 500gb, 7600gt) for £650. The item is around 18 months old with no applecare. The item is not only in mint condition, but also in perfect working order. Are there any issues on this particular model of imac that I should know about? Anything similar to the lines that appeared on G5 imacs just outside the warranty period, or any other known out of warranty issues with this model? Any help or first-hand experience is appreciated.