Hello all. I bought my iMac about 3 months ago, and everything has been just fine. Until yesterday...when it started making this repeating ticking sound every 3 seconds approximately. Other than that it's working good as any other day,but it kinda worries me. I checked the only place it's possible,the ram card slot,but nothing wrong with that.I can't explain what that is and it is really annoying actually.It is too early to start having these kinds of problems,isn't it? Anyway,any help on this issue will be highly appreciated. Thank you. K.