M macfearless macrumors regular Original poster Dec 21, 2009 #1 Everytime I wake my 20inch Alum. iMac, the desktop flashes for a second then the screen goes black for a couple seconds and then the desktop appears again and operates normally. Is there a reason why this is happening everytime I wake it up?
Everytime I wake my 20inch Alum. iMac, the desktop flashes for a second then the screen goes black for a couple seconds and then the desktop appears again and operates normally. Is there a reason why this is happening everytime I wake it up?