First try a hard reset.Unplug it a couple of minutes, then plug it back, set the clock, and try again.
A typical key sequence to cook for a minute a 70 percent power would be:
Cook Time (or "Cook") > 1 > 0 > 0 > Power Level (or "Power") > 7 > Start
It varies by brand and model.
If it still doesn't work you may have a failing keypad. If so, please leave it unplugged or leave the door open when it's not in use, and of course please do not leave it running unattended.
NOTE: FixYa's Web site is currently not notifying us when replies to our Clarification Requests are posted.
So please reply back directly to me with your brand and full model number from the tag in or on the unit for more help or free do-it-yourself tips or an estimate if required.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.William E. Miller
[email protected]http://www.microwavedisplay.com