Salary, schmalary. What do you need with a salary? After all, you're knocking off zombies every day, trying to make the world safe for thousands of computer users. That's in addition to your full-time computer repair tech job. In your spare time, you're leaping tall buildings with a single bound. Oh wait, different career. And you refuse to put on that red cape for any amount of money.
Let's assume, then, that you do need (and want) a salary that lets you pay your bills and live on something besides Ramen noodles. You'd also like to drive a vehicle that's not a Rent-a-Wreck reject. The average annual wage for computer repair technicians is between $35-$40k. Enough to scrape by.
If you’re just getting into the business, you may have to start out closer to $20k, but the opportunity is there to eventually be making $60k plus. Unless you've been troubleshooting and repairing computers since the day you were born, you’ll have a bit of a learning curve. That's a tactful way of saying you'll earn more money when you get more experience.