(This is my first mac & first problem) I am in quite a dilemma right now. My iMac is making a loud buzzing noise and it sounds like it could be the harddrive. However, I use my iMac for all my work duties so if I bring it into the apple store, I will be without a computer until it is fixed. What is the average time that they can diagnose/fix a mac? I know it depends on the issue but if you have had an experience, please report back. I was considering bringing it in in the early AM tomorrow to try to get it back by the weekend. Any additional advice that I need to know? Should i take off my files from my computer? Thanks in advance!