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i have a mac book pro 15inch late 2008 model and the key board stopped working. i can hook up and external key board and that works but would prefer using the laptop key board…..any ideas

Did you spill something on it or open it up? If a spill you can either replace the upper case or with a lot of time and effort find the correct keyboard on eBay and install a new keyboard, The 15" has about 86 itty bitty screws. It you opened it, and i’d go for this first re-seat the keyboard to logic board connector. How are you powering up?