Hey I have a Korg Chromatic Tuner Model: CA-40

Today I turned it on to tune my friends Guitar and The Needle is not moving. I Thought it was weird so I plugged my Electric into the Amp which I know is tuned and still did not Move.

I checked 2 Tuned Guitars to the Tuner and nothing. I Switched batteries also.

Any Suggestions?

oh its at 440mhz.