I have a late 2009 i5 27in iMac. I have had it roughly a year and a half, but have an extended AppleCare warranty on it. I recently moved into a new apartment and have now noticed that my hard drive is making the low "grumbling" noise. It creates this noise when I open up applications or just click links on the web(and a new page loads). It doesn't seem like that big of a deal, but in a silent room it is very irritating, especially when you know its there. I never really paid much attention to it as there was always a low level of ambient noise at my old place. Also, it appears that there are "smudges" on the screen(under the glass?). You cannot tell unless the screen is light colored(like when you restart and the Apple logo appears). I have only cleaned the screen with the iKlear products. It would appear that these are smudges under the glass, I cannot get rid of them no matter what I try. I also have faint yellow tint on the bottom right of the screen. However since this was a replacement model for a unit that had terrible yellowing - I decided to live with this. My nearest Apple store is about a 3 hour drive away. So my question is: if I haul my iMac in with the above problems - will they just laugh in my face? I think it would appear to any "normal" person as a perfectly good iMac. The Apple store will probably be loud enough to not hear the faint rumbling of the HD, so there is strike one. Also, I will admit that the smudges are not THAT big of a deal, but nonetheless I did paid 2,000 for this machine and would like it to be perfect. I am planning on purchasing a 27in Cinema Display to go along with my iMac as well as another ACD to go with my MBP (triple screen setup in theory). Since I live 3 hours away from the store, I would much prefer to just get a replacement model, but I am afraid it will be too late. Would it be possible to pay the difference on the new i5 model or something to that effect? Also, since I am going to be purchasing a Cinema Display from the same store - would they be more inclined to offer me a replacement there? Any response would be helpful thanks!