I bought my current (and first) iMac on 1/1/08. Its a 24, mid-2007 model. I added the maximum memory allowed - 4GB. Ive never had a problem with it and Ive never been happier with a computer. The only issue Ive noticed, is that when my computer is off, instead of a fully black screen as usual, there is some gray sweeping coming diagonally down from the upper left hand corner. It doesnt affect the screen when its on though. At least I dont notice it. (And I assume theres nothing that can be done about it.) Im a basic user. I dont even use email, except to register for sites like this. All I do online is your basic browsing, reading the news, watching TV/Movies on sites like Primewire, use one forum, and watching YouTube videos. Ive also made a few YouTube videos using iMovie and iPhoto. So, my needs are really, really basic. With this said, will I be needing a new iMac soon? How much longer will my Mid-2007 model be supported by software? Is this the time to consider getting a new one? From what Ive seen, Id get the 27 iMac (non-retina), because I dont want to go down to a 21 screen. (And I don't like laptops.) I dont own a smart phone or i-Anything else I need/want it to sync with. I wouldnt mind better speed. My ISP is GREAT! Ive experienced some slowing down on my computer for a few years though. Even going page to page (on both Safari and Firefox) can get slow. In the store, screen to screen action is always instant and I cant figure out why mine isnt. Speed is the most important feature for me, especially when watching videos. (Speed and security/privacy from info-mining companies.) I use my computer about eight hours a day and I usually leave it in sleep mode, which, after a few days, the speed slows even more and I have to reboot to fix it. So, given the condition of my current iMac, should I consider buying a new one? How long until it wont be supported by software anymore? Suggestions and advice would be greatly appreciated!