During the last few months my iMac (MA064LL/A) has developed an intermittent problem which causes it to go to sleep. This occurs at completely random times and under various operating conditions. After doing some research I suspect it could be the cable that connects the logic board to the optical drive (or what else?) but no amount of intervention has alleviated the issue. I really do not want to invest in this machine any more time and money primarily because the OS is stuck at 10.4.11 and I'm unable to stream Netflix content, as well as utilize many programs at once so I've decided to purchase a new iMac. The obvious choice is the current 21.5" model (MC508LL/A) however the yellow tint issue is somewhat disconcerting. I will head over to the Apple store and check out the screen quality but I was wondering if the screen of the previous model (MB950LL/A) exhibits the same yellow tint issue or is that model a completely different beast? The Apple store has refurbished examples of the late 2009 model so it looks like I can get into one fairly reasonably and benefit from the normal warranty. My use of the iMac is primarily for photo editing (CS3) and surfing the web. My primary computer is my business laptop (Sony VAIO). Any and all direction regarding the yellow tint issue and if it affects the refurbished model that I'm looking at (as well as any other buying direction) is greatly appreciated in advance!!!