AHT does not start on OS 10.8.2 - I see only a grey screen, if I stop pressing D computer will boot.
How can I start AHT without an additional install disk - OS X 10.8 was upgraded using App Store so I do not have an install disk on it,
When I keep the D key presses after pressing the power button, I do see only the plain gray screen. Few seconds after I release D key, the system will boot normally - if I keep pressing the D key, the system will just stay with the gray screen on.
I do want to run AHT to test the memory as I do get 1-2 kernel panics a day, and have no kernel extensions.
MacBook Pro, OS X Mountain Lion (10.8.2), Early 2011 - MacBookPro8,2 8GB