My console station can't get any dialtone or any display on LED. Act like keys are sticking. Nothing happen when keys are press on console. I have made sure that keys are not sticking.There is only one dot LED light up were clock is located. I have reseated the both line card and MISC card and also made sure all connector are tight. Can anyone help what is the problem with or do I need to do factory default on it. Please help me