Watch the cable next to where the battery plugs in
MacBook Unibody Model A1342 Battery
MacBook Pro 13" Unibody Mid 2009 Battery
crwdns2890332:0MacBook unibody keyboard ribbon cable won't go incrwdne2890332:0Thanks for this. The new battery I used, moved this cable caused me to think I had a failed logic board. But I found that this ribbon cable was the culprit.