Elmie,
If the light turns on to the "broken switch mode" - i.e., an intermediate brightness setting following a reset - then the switch is On (closed). This can happen for two different reasons. The first cause is that the dome in the switch has been damaged and must be replaced - EDSSC1 (ITT Cannon), sealed dome SPST switch, 120g - available from Digi-key. The second cause is that the positive contact spring has become dished and continuously presses on the switch. The dish can be removed by removing the spring and gently tapping from the back. A third possibility is that both are happening.
Cy can help you with the repairs.
Henry.