Hey all, I know I don't frequent these forums as much as I used to but I'm at a crossroads and I need some professional help. So my late 2009 quad core 2.66GHz 27" iMac last night before I came into work decided it was going to not work. It's extremely hard to describe what actually happened as I've never seen it before. The best description I've found dealt with a graphics issue. Menu bar and dock missing until i could scroll my mouse over it and then it would appear for a second and disappear. Horrible vertical and horizontal lines, especially when switching between multiple desktops (I keep itunes on one, photos on another, etc) Rebooting (hard off) and turning back on let's me enter my password to logon but then gets stuck at the grey apple loading screen at about 1/4 of the loading bar full. Calling apple support he said its most likely due to me leaving the computer sleeping often (I never turn it off, or don't as much as I should?). He stepped me through reinstalling OS X.... unfortunately seems like the same problems. I didn't have much time to troubleshoot before I had to leave for work. Is this issue a common thing? I used it late last week and for the last 7 years with no issues like this. I'm just kinda stumped. I have voice notifications on, so when it goes to the apple logo loading screen it notifies a me that iTunes needs my attention. Hitting the play button resulted in music starting to play too, just never went past 1/4 loaded for a half hour or so. Thanks in advance for the help guys. I'll be asleep shortly so I'll answer when I arise later today.