i took it apart and did a test. if i press down on the mainboard, where the main display connector is (left of the area between the keyboard and the trackpad) it works well. if i let go - blank screen. so this has to do with the video chip. i'm assuming that since in the burning 'tutorial' the author has the video ship on the back of the motherboard, i'll have to apply the heat on the top side, where my cip is. is this correct?

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edit: we posted almost at the same time, sorry about that. this is great, now i'm starting to get the picture. i'll check on the ibook tomorrow morning, and report back. i can't thank you enough for your tremendous help. i might be able to do this myself.