Do not heat the bed or hot end to operating temp yet. First make sure the heaters and fans function correctly.

Set the bed temp to a few degrees above the ambient temperature and turn the heater on. You should see the bed heater temp rise. If it doesn't, check your wiring. If it does turn the heater off and processed.

Set the hot end temp to 50c. We want to heat it up enough to cause the cooling fan to turn on but not hot enough to cause damage if there's issues.

Don't forget to select the name of the hotend or else it will remain in an off state

Turn the layer fans on with the slider on the Status tab. You should visually see the layer fans spinning