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The best way to check that the power is available is with a solenoid-type tester, available in any good hardware or home center store for about $10-$15. This type of tester will put a load on the circuit, thereby eliminating the possibility of a false reading that will sometimes show that a fuse is good when it is not. An acceptable substitute for this type of tester is a light bulb of the requisite voltage in a pigtailed socket. Always check from the hot lead to ground, if there is a ground present.
If the power checks out at the fuse box or breaker panel, go to the next point in the circuit and check for power there. If power is available there, keep going on down the line and testing. When you get to a point where there is no power, assuming all switches in the circuit are on and working properly, the problem is between the last two places tested.
If you cannot find the problem, or do not want to take the risks associated with the testing, by all means call us - we're always ready and willing to help you in any way we can, whether advice over the phone or in person, or by a service call from our well-trained, friendly staff.