Hi. My seldom used MP3 sat for six months. When I went to start it it would not turn over. T.he battery was dead, dead, dead. I replaced it and now when I try to start the machine the fan comes on, the indicator lights illuminate but the bike will not start. Also, the stabilizing system does not activate. I've read other posts on forums and have made sure the battery is fully charged. I do not have the master key to try but this has never been an issue in the past. Thoughts?