Hi. Sounds like it has been off for too long. the battery will have gone flat and lost all programming. You need to check the internal battery, as it leaks badly in these, and wrecks the main board if not changed every three years. Then you need to do a full reset, which is a bit tricky. If you need more help, I'm called 'NZtech' at EPOS wizard site(google it)
mark, May 2008