Mike

TRY A NEW TRACKPAD CABLE! I have a Macbook Air 11" Early 2014. A few weeks ago (May 2018), the fan started running crazy all the time, and the trackpad and keyboard stopped working. Fortunately, I was able to use my bluetooth trackpad and keyboard plugged-in to check some things. I ran Apple Diagnostics and got these error codes: PFM006 and PPN001. After trying a bunch of things (attempting to reset trackpad settings, dust off the components), I finally bought a new $9 trackpad replacement cable on Amazon and switched it out. My computer works good as new now--the fan stopped and the keyboard and trackpad are functional. If you or someone you know have the small pentalobe screwdrivers, it's an easy do-it-yourself job. And, fortunately for me, it was not due to an issue with the battery swelling, logic board failing, water damaged trackpad, virus, etc. Start cheap and small, troubleshoot the issue. Don't pay $100 to have someone "take a look at it". Cheers, Mike TRACKPAD CABLE...