My GE spacemakerXL 1800 microwave model JVM1871SK03 is stuck and demo mode. How do I get it out of demo mode?

SOURCE: GE Microwave DEMO MODE

I just bought a condo with a GE Spacemaker Mod# JVM1860SD
that was stuck in demo mode. (This mod# has been replaced by the JVM1870*** series)

I called GE twice in two days, and finally got someone who had the solution (and it worked):

1. Unplug the unit for at least 30 seconds
2. Plug the unit back in DO NOT SET THE CLOCK
3. While the unit is still "booting up" and the display screen is lit with gibberish, HOLD THE POWER LEVEL AND THE ZERO BUTTON for at least 5 seconds.
4. After 5 seconds, the screen will display "demo mode off"

SOURCE: I have a GE SpacemakerXL

Thanks for the opportunity to help! To see if this fault can be cleared, do the following:

1. If your unit is plugged into an *outlet (most times, this is located over your microwave in small cupboards).
   
2. If it is, unplug the cord and wait about 30 seconds.
3. Plug your microwave back in and see if the panel now works.
4. Go through all the initial setups such as setting the time.
5. If the fault does not reappear, then you are good to go. If the fault reappears, you will have to call service or replace the product.

SOURCE: Microwave oven (nn-sd997s) stuck in

Pressing "timer/clock" button 4 times turns on and off demo mode.

SOURCE: we had a power blackout now my panasonic genius

DEMO MODE ON/OFF
Demo mode is designed for retail store display. In this mode, the oven can be demonstrated with no power in the oven.

On the "Timer/Clock: button:

4 taps ON The oven is in Demo mode.

4 more taps OFF The oven is not in Demo mode.

SOURCE: I have a GE SpacemakerXL

When there is no heat, but everything else seems to work, it means the magnetron circuit has failed. The magetron is the part the generates the microwaves that heat the food. When it fails, it makes a loud buzzing sound. The replacement part can cost as much as a new oven, so it not worth fixing. Get yourself a new oven.