I always like to put tips when I run into a problem and figure out how to fix it. After giving a presentation on my Toshiba Satellite laptop, my touch pad mysteriously stopped working.
I did a search on the web for possible fixes and nothing seemed to work. I then remembered when I projected my laptop onto a TV screen, I tried CTRL F5, instead of CTRL F4. The CTRL F5 is a toggle function to turn your touch pad on and off. So if your touch pad stops working, try CTRL F5 on your keyboard!