The timer dial has become loose causing the machine to not start. twisting the dial will usually get results. Does the timer mechanisim need replacing?
Here are your parts
Replacement parts for General Electric GSD2200G00WW Dishwasher | AppliancePartsPros.com
[COLOR=“Blue”]
Does the timer mechanisim need replacing?[/COLOR]
Does sound like you need a new timer, you will have to open it up and check the timer to be sure. Perhaps only the knob needs replacing.