There are multiple problems with my iMac. For starters, even though it should be much faster than my previous dual core iMac with only 2GB RAM, it's much slower and has been since it was taken out of the box. It takes much longer than it should to do simple video work, which is what I bought the iMac for in the first place. Windows Vista in Boot Camp is the same way, leading me to believe it is a hardware issue. In addition, like many others, my screen has a yellow tint on the bottom half of the screen. Let me just say this, it's barely noticeable. You have to be really looking for it to see it. Basically, my iMac - Is very slow - Gets too hot/fans on too often - Has a bad screen - The mouse/keyboard stutter when external display is plugged in (even when it's a wired mouse/keyboard) - but weirdly, it only does this when the external display is plugged in but on a different source. For example, when it's connected and the second monitor is on DVI, displaying my computer screen, it's fine. But if I switch the source to HDMI and use it with my PS3, it stutters. But I'm not sure if it's enough to warrant a trip to the Genius Bar. Just because it feels slower to me doesn't mean it is, but the fans seem abnormally loud. I don't want to reinstall the OS in the fear that it would temporarily fix the problem, so when the Genius Bar looks at it they don't see any problem but a week later it'll come back. I have an appointment with the Genius Bar tomorrow at one, but I'm a bit nervous to go because I think that either a) they won't see the issues as enough to warrant a replacement or b) it'll decide to work, and look perfect to them. It's a hard issue to show, because it happens seemingly randomly. I attached some screenshots at the bottom of this post to show how much the fans will run. This happens completely randomly and doesn't seem to be tied to any program. Does this, my very slight yellow screen, and the slowness warrant a replacement?