The red light comes on saying that it is 'on' but when I push the button to pulse, nothing happens. The bowl is on tight.

Does the light come on when you open the door? If it does, I would venture to guess that the keyboard is bad.

If the timer counts down and nothing else happens, the secondary interlock switch is bad. This switch completes the cook circuit and this is why it doesn't run. You need an ohm meter to diagnose and find the right switch. Switch failure is caused by opening the door when it is in cook mode. Push the stop button first before opening the door and this failure will cease to occur. BE CAREFUL !!

Check those 3 micro switches in the door latch assembly. "my husband says that if you push the door it will work."

U need to replace the control

Sometimes mating the bowl to the base does not depress the indented safety start button at the front of the base. This can happen more often if you pre-assemble the bowl and lid before mating to the base. Sometimes also the plunger rod in the bowl (that pushes the indented safety button) gets fouled with debris and does not slide nicely up and down. You may have to clean that area.
Test the safety button .... take the bowl off and take a small screwdriver to depress the button while activating the start lever. BE CAREFUL ... since the center drive cylinder will spin. If the motor turns on and drive cylinder rotates then the problem is how the bowl was mated to the base. If the motor does not turn on ... then it could be the motor/wiring/switch.
Helpful?
Good luck with your troubleshooting

thats what the express does its a one button start it
there s nothing wrong with the unit it is doing exactly what is programmed for what you are pushing

hello mam
i am having the solution for this problem check the lock terminals for loose connection and if its working and check the magnetron which produses the heat inside the microwave.

have a good look at front to see reset??.press it once it comes back on unplug from the wall and & open it up and go to the part and give it a good clean with wd40, check the push pad for ware & tare dirt gathers and builds up

possibly a stuck button which would mean a replacement pad, do the buttons bleep when you push them do some work and others dont its quite common normally its the start button or the cancel which goes(due to constant pushing) and it causes the error alternatively its a possible logic board fault which is far more expensive to replace!