Washer would fill with water then do nothing

I'm not a professional repair person, so diagnosis was more difficult than this repair was. A little research online and some smart investigation(and by smart I mean unplugging the washer before taking the access panel off); resulted in a less than $30 repair - compared to what would have been close to a $150 technicians visit and repair! Simply unplug the washer, unscrew the access panel, unscrew the lid check switch, screw in the new switch, put the panel back on, plug the washer in, and start the wash cycle. Seriously, less than 15 minutes!