Toilet Shut Off Valve How Do I Know If Its A Bad Shut Off Valve To My Toilet?

How do I know if its a bad shut off valve to my toilet? - toilet shut off valve

The float is broken, and I turned off the faucet. replace the ball and turned on.It line makes a noise like a liberation from the accumulation of air in the line, but GE does not flow water. The water was not less than 24 hours, could the accumulation of mold? im confused? that worked fine yesterday. Please help. I do not know the water. I live in a mobile home and the sink, bathtub and washing machine working well?