If you can hook up a computer, do basic things like add hardware and programs, hook up wireless connections and other computer repair and set up items, you could make excellent money with a mobile computer repair business of your own. There are lots of people who basically just use their computer and that's it. They do not really understand much more than how to use it. Just like some people with cars, they drive them, and lots of people, do not know the first thing about working on them. When a new printer, digital camera, picture printer, or some other type of hardware or software that needs to be installed, they have someone else come and do it.
You could remove virus, adware, spyware, and other threats from customers computers. Lots of people buying new computers and hardware on a regular basis, they will always be in demand. Someone that buys a brand new computer and brings it home, sometimes needs help setting it up, and getting it to go on and connect to the Internet. Most of the time, the customer just wants to get on the Internet, that is all they are concerned about most of the time. They do not care how you do it, just as long as they can connect them online, or fix a bad working computer, or remove any threats that they have, if you can do basic computer functions, you can start your own mobile computer set up and repair business.
For more advanced computer troubleshooters, you can reach out to businesses and offer a maintenance schedule for a certain fee each time you come and work on their computers. You would want to make up some nice signs for your automobile, so customers can call and contact you. You could make up some nice fliers and distribute them to electronic stores, computer stores, libraries, and more.