If your touch pad no longer works its possible you've accidentally tapped the Fn key + F1 key which stops the touch pad from working. That happened to me!
You can press the Fn + F1 key to enable/disable the touch pad.
Here are other keyboard shortcuts:
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. This post has been scraped in violation of that license if you are reading this post on other than http://www.digital-qa.blogspot.com/.