I bought a 2011 21 inch iMac from a seller through Amazon, as Amazon itself was out of stock by the time I ordered (not entirely true, since it showed as being in stock at the time, but nevermind that just now). In mid-2011, I bought the same iMac and it had a yellow screen. I returned it the next day and decided not to get another one. Skipping ahead to now, I bought another one, this time from an online source, and I'm pretty sure it has a partial yellow screen issue. The left side seems okay. The right side, though, appears to be yellowed. By moving windows with white to both sides, I can see the difference between the two. My question is whether this is something that could end up evening out on its own, or if I'm stuck with an uneven screen for as long as I have this iMac.