I have a KENWOOD K20MSS10 Microwave Oven, and lately it is not allowing me to choose any option and start heating up the things, as the LCD shows some garbage signs like this, [-_-_-_ ]. It also keeps on beeping after regular intervals: 15-20 minutes.
could some one let me know that what is wrong and how can i fix it?

thanks

Hyder, August 2011