bazzano

Hi guys, For some reason my varian modelling and tuning has stopped working on my 89f. I have only had it for a week and it was working previously It has a bull battery and 1/4 jack is plugged into the guitar with the volume on full. If i push the model button nothing lights up. It was working previously but now not working any ideas? When i put the battery in it shows that it has full charge with all green lights showing.