Macbook Pro 2 ghz shipped with 1 gb Ram. Will not boot when I add another 2 gb ram for a total of 3 gb per Apple tech website info. The laptop does boot with EITHER 1 gb ram or 2 gb ram installed but not both. I have tried exchanging the module between the top and bottom slots and again will only boot with one ram module card installed. Does anyone have work arounds? Thank you !