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Make sure the Ground/ Earth connection is good before proceeding by using a multimeter

Touch one of the probes onto the earth/ground terminal of the power supply

Connect the other probe to the edge of the bed or any other part where bare metal is visible (inside the mounting holes works too)

Set your multimeter to the lowest resistance rating (often this is 200Ω)

Only proceed to the next step if you obtain a reading of less that 1Ω