Hello, I have read many forums and articles about gray screen, however none seem to reflect my particular dilemma. It all started last July when I went out of town and left my computer unplugged. When I returned, the computer would no longer immediately enter sleep mode when I closed the lid. It would take ~60 seconds if not longer. After finally going to sleep, I would open the lid and get a gray screen. No apple, nothing spinning, not even the mouse. I would have to hold the power button down and then reboot. If I opened the lid before the apple light was out, it would look "normal" (as if it didn't go to sleep). Then after a while it would go to a black screen (what I assume is sleep mode). I would still have to power down and reboot. Also at that time Safari was VERY slow. I have AppleCare, and did everything they asked - deleted Safari preferences, reset Safari, deleted new apps, powered back up with Alt-Comm-P-R, rebooted in Safe Mode, and tried another use (which worked fine), along with a few things I don't remember, all to no avail. Then Finder stopped working, so I deleted the finder preferences (.plist). Lo and behold, that solved the sleep/wake problem. Or so I thought. Now, it's doing it again, but the Safari and Finder are fine. I have gone through this list again, to no avail. Can someone please help me. I have a MacBook Pro (early 2011), 8 GB memory, Intel HD graphics, Lion 10.7.5. Also, I have also tried repairing permissions. Thank you.