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Hi Here is my Mac Specs: MacBook (13-inch Mid 2007) A1181 . Core 2 duo 2.0 Ghz I’ve replaced the top case by one bought on Ebay. They said it works for A1181 & A1185. The Mac starts, i’ve a grey screen with the bong for 2 sec then the screen is black. (but computer still ON) The vendor says in the item description : “ps:our keyboard support the 945 chip.if yours is 965 chip,you only need to reset the drive.then it can work well.” Any clue ? Does he mean driver instead of drive ? Thanks for your help Regards Sam

Try resetting your PRAM. Instructions here.