Harman Kardon AVR 125 Receiver "sing function" Questions

...kenwood kr-7600 with no sound output. i plugged an elect. gtr. into the mic input that is for 'singing' along with a tape. then, i played for a bit. i took it out, and stopped using that

HK avr125 5.1, no display, no functions. My HK avr125 has no display and no functions except the input indicators and the surround mode indicators light up. There is no functions at all, I tried to ...