I have 5 outlets in my livingroom. The 2 on one side work the other 3 do not work. I bought a little tester and the tester lights in one but not in the other 2. When I plug something into the one that lights, such as a lamp, it does not work. It is like there is enough power to light the tester but not enough to run anything. Can that be? What would cause this to happen because they used to work. And what can I do to fix this myself or do you think I can without a professional?