Hi, My iMac starts making a tickling noise from somewhere on the upper (left?) side of the screen. It only happens when I'm playing a heavy game. The sound does stop when I do either of the following: - stop looking around in the game, still view. - turn down the brightness - switch to desktop - If I ignore the sound it will stop after a while too, but it's scary It increases when I turn up the brightness. The performance does not get affected in any way, as far as i see. I cannot recreate the sound using SMC control. AHT returns no errors. The iMac is a CTO all out 2011 27" model and I upgraded the RAM to 16GB and added a SSD inside, behind the optical drive, myself. The SSD installation went smooth and had no problems for over 4 months. What are your opinions on this? I'd like to fix the sound as it does not sound right. Should I remove the SSD and send it to apple? I do have extended Apple Care. Thanks for reading. If there are any more details needed please let me know.