5 years makes me think it's the cmos battery. try replacing it and see if it works, could be a ~£3 fix
@HatBeard started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
5 years makes me think it's the cmos battery. try replacing it and see if it works, could be a ~£3 fix