DIAGNOSIS A dead panel with a humming sound points to power reaching the main control board, but the board itself not initializing or a critical safety device (like a thermal fuse) being blown. The hum is likely the motor receiving power but the board not telling it to start.
FIX 1. Unplug the dryer for a full two minutes. This resets the main control board. Plug it back in and see if it wakes up. 2. If still dead, check your household circuit breaker. 3. The next most common culprit is the thermal fuse—a one-time safety device that blows if the dryer overheats. On many dryers, it's located on the blower housing or exhaust duct. You'll need a multimeter to test it for continuity. If it's blown (open circuit), it must be replaced.
IF THAT DIDN'T WORK If the thermal fuse is good and power is reaching the main control board, the board itself is likely faulty and needs replacement. This is a more involved repair.
HEADS UP That thermal fuse doesn't blow without reason. If you find it blown, you MUST find and fix the cause—always a severely clogged vent, a blocked internal duct, or a failing heating element that's running non-stop. Just replacing the fuse will lead to another blow-out or a fire.