My questions is: i have No sound from my wireless microphone, what can i do?

Make sure microphone is on
Check battery level, replace if necessary
Make sure the system is turned on, and appropriate audio levels are turned up
Check that audio "Mute" on the control system is not selected
Make sure microphone cord is securely plugged into belt pack
Check that the Mute switch on the microphone is set to "ON" and not "MUTE"

Have mic capsule replaced. Test by slapping the windscreen briskly, if sound returns, mic needs repair.

Wiggle the cable for the mic cord @ the transmitter input, wiggle the cord at the base of the mic, and run the cord between your thumb and forefinger. If you hear large amounts of static at any of these points, you have an open/short in the cord.

frequency of xmitter is not that of recevier and if dropped or mishandled the tiny red and white wires behind the mic to the board have been torn