buttons

Hello, I have problems with bike computer - Speedometer. I have disassembled the bike for service purposes and now when I have put it back together buttons of the speedometer wont work. They wake up speedometer but nothing else. I cant move through menu. What could be wrong? Regards, Blaz

Can any tell me what the three function buttons do and which one does what there seems to be one button that doesn't do anything not sure if the pack is faulty. When you press one of the buttons every thing lights up then the total mileage flashes up then goes off and is replaced with the...