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1 Use the number buttons to set a cooking time. You can set a time from one second to 99 minutes, 99 seconds. To set a time over one minute, enter the seconds too. For example, to set 20 minutes, enter 2, 0, 0, 0 . 2 If you want to set the power level to something other than High, press the Power Level button, then use the number buttons to enter a power level. Power Levels: Level Cooking PL 1Warm10 2Low20 3 Defrost 30 4Medium Low40 5Medium50 6 Simmer 60 7 Medium High 70 8 Reheat 80 9 Saute 90 10 High Hi
I see by looking at the owner's manual there is an option to set power level from 0% to 100%, maybe that is set too low (see page 14 of manual). If don't have manual for that model (LMVM2277ST), can get from this web page (look near bottom of page and click words "owner's manual" that are underlined) :
The first thing I would suggest is to turn off the breaker or unplug it from the wall for a few minutes to "reset" it, then try again.
If a reset doesn't fix it, I would think you may have a defective magnetron.
When you heat something of very low moisture content, it can lead to microwave energy not being fully absorbed, but instead being reflected back to the magnetron. This can damage it.
This is usually best left to a pro to repair.
In case it might help, your owner's manual can be found online at: