A refurbished i7 + ssd? I've never seen that in the refurb store.
But here's what you should look for:
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Yellow tint issue (
https://forums.macrumors.com/threads/824940/)
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Hard Drive noise (grumbling, clicking)
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High pitched noise when changing the backlight (usually between 20%-80%)
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Backlight Bleeding (you'll always have a bit, just make sure its not excessive to the point where it interferes with your work or anything else... good way to check backlight bleed is to start up a video as right in the beginning most videos are black, just put it on full screen, make sure the room is dark, and you'll see it if you have any)
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Dead/stuck pixel
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Frequent overheating (iMac i7 gets really hot, but just make sure its not constantly overheating)
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Scratches on screen (if you have any bad scratches make the background white and you should see a multi colored reflection in the scratch.)
- Cosmetics
These are some of the things that I would check for. Obviously some of these might not bother you, it's different for each person.
Having just returned my 3rd iMac in 2 weeks for some of the issues above, I suggest you make sure that you are completely happy with your new mac. You spent a lot of money on it, so if there's something that bothers you it's best to get it fixed now then being frustrated later on.
Enjoy your
