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Sam4s ER 290 Cash Register that just beeps!?

Hi, my Sam4s ER 290 Cash Register has not been used before. When it is switched on and the control key turned the either the reg, x or y position the till just beeps with message on display 'Warning, sequence error'. None of the keys respond. How can I resolve this? Thanks
Mark, November 2009
when i switch power on it prints

..........PL
*.......2.20ST
the key is in the off position but the display is on
when i switch key to r it starts to beep and wont do anything

michael, August 2011