OK, I ordered a 27" i5 on the 23rd of January and received within a few days. It's only been what, a couple of weeks now, and I've noticed two things:
1) On two separate nights I heard a humming noise. Not a constant humming but one that would increase slightly then back down, then increase again, then back down again...repeatedly. I Googled and discovered this is a somewhat common phenomena, so I wasn't too worried.
and
2) Yesterday after turning on the iMac and browsing the internet for a couple of hours, watching quite a few YouTubes and what not...the screen went black. I clicked the mouse and hit a few keys on the keyboard but I could not get the screen to return. I went to my iPad and Googled and read that this too is a somewhat common phenomena and to turn it off, wait a bit, then turn it back on. I also learned that setting up a hot corner in Expose to activate the screen saver is a known workaround so I set that up in case it happens again.
OK, so here's my question: Since this machine is refurb, or even if it weren't, would you worry? Should I call Apple and report it? Do they keep notes on this kind of stuff? I have a full 1-year warranty so I'm not overly concerned but if it should be replaced I would rather it be replaced now, wouldn't I?
Any advice is appreciated. I love this machine and I'm not one of those "look for things that are wrong" people. I'm easy to please, if you will.
Thanks!