This is coming from a very small amount of experience in troubleshooting electricity, First thing you need to do is going any hardware store that carries electrical supples. You need to get a fault detector. The normally look like a large plug that has some LEDs on it that when you plug it into the wall outlet they will tell you if there is any problem with the circuit. It will tell you if everything is ok, if there is a cross or and bad ground. If all you circuits come test clean then you need to get a good meter that can measure both volts and hertz. These will cost you some cash but you will be able to test more effectively. What you need to do is plug them in to you wall and make sure that your readings and where they should be. 120 volts and around 60hrtz. These numbers should not go up and down at all if they do then you have a problem and need to call you power company.