Chosen Solution
I have a macbook air that I’m currently trying to fix that has an issue with the trackpad and the keyboard, where randomly the trackpad will only do right clicks and the keyboard will act like it’s completely out of wack. By “out of wack” I mean that buttons seem to be doing other buttons, pressing letters when trying to type in text fields will make the f*ck off noise (for lack of a better term) and keys like H will backspace, and the enter key will start putting letters. Sorry for the poor explanation but I really don’t know how else to explain it. We have reset the preferences, looked through the preferences, reset PRAM, reset SMC, used different user accounts. This also happens when you use an external mouse and keyboard so it doesn’t seem to be a hardware issue. I don’t know too much about macs and their operating system so I’m kind of stabbing in the dark here, any advice would be awesome.
It sounds like the system had either a liquid spill or the battery swelled, so the keyboard and trackpad are messed up. Often times I find the cable or the trackpad has suffered the most damage. Unlike the Pro systems, the Airs share a single cable connection to the logic board from the trackpad. You’ll need to pull the battery to inspect (replace) the cable MacBook Air 11" (Late 2010) Trackpad Cable, then I would try replacing the trackpad next MacBook Air 11" (Late 2010) Trackpad following this guide MacBook Air 11" Late 2010 Trackpad Replacement
For the trackpad, check for any bluetooth mice. That happened with me.
