So.... I recently upgraded to a MBPr and gave my brother my iMac. He doesn't really use it, but it will make a good family computer and I think I'm going to buy him a Macbook air when he gets ready to go to college. However, I'm having issues with this old iMac. It's a 24 inch from 2007 and it started having issues when I reformatted everything and tried upgrading from I believe tiger or lion all the way to mavericks. I got as far as Snow Leopard and then had issues when I tried to install mavericks. Now I've been battling with it. Tried booting in safe mode and tried to even get safe boot to work. Did the verbose mode and got disk0s2 over and over again. Finally went to go get my snow leopard dvd and ran disk utility. Verified permissions and it said it found errors and it was done, but then the drive disappeared from disk utility. This whole time the HD or optical drive has been making noises that don't sound good. And the SMART thing said the drive was about to fail. And I just restarted it and opened disk utility, and the drive didn't show up. As of right now, I'm assuming it has fully failed, unless there is another option to try to fix it? I figured someone else may have run into this problem before. Fortunately there wasn't a thing really on the computer, so formatting drives isn't a big deal. Right now I've got the ifixit guide pulled up and was reading through it to see how difficult it was to change the HD myself. I took PC repair in HS and have graduated college and am pretty comfortable around a computer, and, while I had applecare on it for the two years after I bought it, I'm sure the warranty is probably expired and applecare is no longer applicable. So basically I'm asking: 1) is there any other way to fix it beyond what I've tried? 2) a friend of mine also had his hd fail in his iMac and it was like 200-300 i think to fix, but i could be wrong. and his was part of a recall potentially but something about it didn't qualify him. So far it's looking like it would be cheaper to do it myself and I feel comfortable doing it (i've also always wanted to open it up anyway, so I guess now is as good of a time as any). But does anyone know any price specifics of both (or other) options? 3) I never really wanted to sell it because the screen is decent and I got used to the 24" so my 15" is smaller than I'd like for some of my photograph workflow. Is there anyway to convert it, either replacing the HD or not, to a secondary monitor for my MPBr? Thanks for any advice you can give. All drives fail eventually, I guess 7 years was a good run.