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The Keyboard and Trackpad on my 15" no longer work and to us the computer I have to use my extermal USB keyboard and mouse. Would it be the flex cable that connects the Trackpoad and Keyboard to the motherboard that has failed and can it be easily replaced?

Apple part # 922-8035 & 922-8350 Keyboard with cable As far as I know the cable is not sold separately. Here’s how to replace it: MacBook Pro 15" Core 2 Duo Models A1226 and A1260 Keyboard Replacement The parts are different for the A1226 and A1260 so check under relevant parts on this link for the correct one: MacBook Pro 15" Core 2 Duo Models A1226 and A1260 Keyboard Replacement