HELP...

[Eamonn McG]

HELP!!! I went outside today and noticed my left blinker was on althoug the engine was not running, and the blinker position was centered....i started the engine, moved the blinker into the left position and then back to center and the blinker stopped, but then i went into the cabin and turned on the overhead light which turned on, but then once i turned it off nothing else in the cabin would turn on again. anyone have any ideas what this could be?