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http://www.user-guides.co.uk/cddownload/Acer/AcerTravelMate/Acer-TravelMate-4150-Service-Guide-Manual-Disassemble-Remove-Replace-Repair-51064.html
I would remove the memory and turn it on.. see if it give you beep codes.. if not then you most likely have a bad motherboard.
To usualy remove the keyboard you need to easily pry up the plastic piece above the keyboard.. as long as you have removed all screws from bottom and back then it should be able to pop up.. then there might be a couple of small screws holding the keyboard in.