With the exception of some very, very minor yellowing and backlight bleeding, I've had a near flawless iMac, but one thing does seem odd/ concern me. Whenever I power down my computer (put to sleep, restart or shut down) something in the computer makes a clicking noise once. At first I thought it was the hdd, but it didn't seem to be coming from the exact same location or had the same sound as its usual faint humming. When shutting down, the click happens halfway during the blue screen, so it seems as though the internals in the computer power down before the screen itself shuts off. Either way, am I the only one who this happens to, or is it just a regular thing that comes standard with the internals/mechanisms of the new i7 versions?