I'm posting here because this issue seems to only happen on my iMac, not any of the other models I own. My Intel iMac (Late 2008, aluminum display, 24", 2GB RAM) has a problem where, when using the left arrow key on the desktop or to go back a space when renaming something in the Finder, it will put the computer to sleep. All other applications have no problem with the key. I've looked at all the usual culprits (keyboard shortcuts, preferences) and I can't find a reason. The only thing I can glean is that it is directly connected to the menu at the top, as the lights up right before the computer goes to sleep. Anyone know of a reason why this should happen? I don't think I've changed any settings to make it happen.