My Nexus 10 is making a squealing noise, it originates around the top left corner where the buttons are. I think it just started, luckily I was on day 14 of ownership so I have initiated a replacement from Google. It is only there when the screen is on, so I guess it is something to do with that. Mine also would make a crack noise when I picked it up sometimes, not a big deal, certainly not a reason to return it but still kind of annoying. I guess something flexes in it that makes it crack. I hope the next one is free of both of these faults... and does not have any new issues. I am really enjoying having a tablet though. The hi res screen is awesome and the battery life is excellent.