I got an iMac precisely 2 weeks ago, it was actually a birthday present. This imac is a very problematic machine. First, there are almost 5 dead pixel. Second it has condensation issue it appeared 2 times this week. Thirdly, it always crash and freeze when running apps like screen saver, limewire. The fan once sound like a car accelerating. I phoned apple care several times and they agreed to change for me one but when i sent it to the reseller they said that it was more than 7 days so they can't replace me a new one, so called the manager and he said that he wants to check first. I'm so worried that they can't detect the problems. What must I do??