If your touchpad has a small logo/icon in the top corner, try double-tapping it to see if your touchpad kicks back on. If you tap this icon, you’ll turn off your touchpad. This can often be found on the top corner of the touchpad-and it’s usually indiciated by a logo/icon. Some touchpads come with a built-in disable button.
If you can’t find those, try going through each Fn key and see if one of them turns your touchpad back on. You can try the F9 key, or look for the Fn key that has a square next to a square with a line through it. (A lot of laptops use the F9 key, though.) Of course, this variation varies from computer to computer, so we can’t tell you precisely what buttons to push.
If this is the case for your computer, it is possible you accidentally disabled your touchpad by pressing this combination on your computer.
Some laptops have an Fn key function that disables the touchpad.