Unplug the appliance.

Unscrew and remove the terminal block cover plate, found where the cord enters the electrical device.

If there are any signs of damage, replace the block.

If the block is OK, test the power cord.

Set your multimeter on the RX1 scale.

Clip the meter probes to the plug's outer prongs.

Clip jumper wire across the outer cord terminals.

Bend and pull the cord. Replace the cord if the multimeter reads above zero ohms or fluctuates.

Clip the jumper across the middle and one outer terminal, then clip the multimeter to the corresponding plug prongs. Look for steady zero-ohms readings. If readings fluctuate, replace the cord and/or plug.