If turning on a wall switch doesn't blow a fuse or trip the breaker, the trouble is in the lamps or appliances.

• Test them by plugging them in one by one.
• If the circuit doesn't go dead, the circuit was overloaded.
• Move some of the lamps or appliances to another circuit.
• If the circuit does go dead just after you've plugged in a lamp or appliance, then you've found the offender.
• If the circuit goes dead as soon as you plug in a lamp or appliance, the plug or cord is probably at fault and should be replaced.
• If the circuit goes dead when you turn on the lamp or appliance, the appliance or lamp or its switch is probably defective and should be replaced or repaired.