It is possible that your shaver does not turn on or move because it is dirty. There can be hair or dirt particles stuck inside it, causing the shaving heads to be blocked.
To fix this problem, properly clean your shaver. If possible, remove the shaving head and clean your shaver from the inside as well. For detailed cleaning instructions, refer to your user manual.
In some shavers, a cleaning reminder symbol will blink to let you know that the shaver needs to be cleaned.