Does this happen to everyone? Does your I mac go into sleepy mode when you move the mouse to the top left hand side of the screen?

Answer:
Go into setting - expose, then active corner - change the setting. Easy.

Have fun with your iMac… MACS RULE!

Answer:
Macintosh HD -> Applications -> System Preferences -> Expose and Spaces -> Expose -> Active Screen Corners. Change settings.
Answer:
no it can't

there might be a problem