iMac 27" 3.2 GHz i3 (Model 11,3)
OS X 10.8.2
8 GB RAM
1 TB HD (70% capacity availabile)
All Apple Updates are current
Occasionally, when I wake my iMac from a sleep, the display is white with a visible black mouse cursor. When I move the mouse pointer around the display, it reveals the image behind the white screen one pixel at a time.
I've seen this on a MacBook Pro's running OS X 10.7.
Any assistance would be appreicated.