If your printer happens to power off during the initial preheating process, there's usually no serious damage. Most likely you just have the voltage switch set to 220V in a 110V power environment.
Turn the printer off and remove it from the power source.
Find the AC voltage switch for 110v or 220v on the PSU.
Make sure that the rocker is switched to your local voltage setting.
Try to turn the printer on again.
Both the silver and black Delta PSU for MK3/S/+ will automatically switch between 110V and 220V, depending on the grid it is connected to.
Checking status-LED on the PSU
Every PSU has a green indicator LED to show whether it is active or not.
The silver PSU has this located inside its case, seen through the metal cover, in the bottom-left (purple arrow).
The black Delta PSU has this LED hidden behind the cover of its terminals. Remove the two screws on the cover (green circles) to reveal the terminals, for probing with a multi-meter, and the green indicator-LED (orange arrow).
The power switch on the black Delta PSU does not have an LED.
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