Answer to "Internal keyboard and trackpad not working"I run a Helpdesk at a small University and we have seen three of these in the last month. The only fix I have found that worked consistently is unplugging the battery (old school smc reset). The regular SMC reset hasn't done it, nor has reseating the cable. Sadly, the problem usually comes back. One of the customers said her friend had taken her Mac into an Apple store before Christmas for the same problem and they told her that they had seen a lot of these and they knew what the fix was. Five minutes later they gave her the computer, but did not tell her what they had done. I look forward to trying the solutions above. Thanks a lot for the suggestions.