Hello all, I have documented this in another thread but I thought it would be better to dedicate a thread to this "problem". I bought a new entry level iMac the other day. At night, before putting the computer to sleep, I often put the brightness of my screen all the way down to 1 notch so that when I wake the computer up in the burning the display doesn't burn my eyes. So, I did this with the new iMac. When I woke up in the morning to check my email, the computer came out of sleep fine, but the display was flickering. As if it was pulsing between a brighter brightness level and a duller one. The problem continued when I increased the brightness to 2 and 3 notches, but seemed to disappear after that. I have been able to recreate the problem many times (it is not intermittent) and it is also noticeable if you shut the computer down on 1 brightness notch and start the computer up a few seconds later. I PM'ed someone in this forum who bought the very same computer as me and he was able to recreate this "problem". I was wondering if all of the new 21.5" and 27" iMac users could try the following: Put your computer brightness down to 1 notch. Put the computer to sleep. Wait about 30 seconds. Wake the computer up from sleep, and focus on some part of the screen. Does it flicker? Does it disappear when you increase the brightness level? I don't know if this problem is that major as I very rarely use my machine on such a low brightness level, but in the morning, when you've just woke up even the 1 notch of brightness can seem exceptionally bright! Let me know if you can recreate this problem on your new iMac. I think it could have something to do with the new LED backlit display. Thanks in advance, Shaun.