Check / replace the filter. Many fridges have a filter readily accessible from the fresh food compartment. The filter should be changed at regular intervals for best performance. A filter that is never changed will reduce and eventually stop water flow through it.
Check the temperature of the fresh food compartment near the filter. It may be "flirting" with the 32 degree mark. If it is this low, water has turned to ice - and will stop water from flowing. Bump the temperature up a tad to see if it solves the problem.
Lastly, the water supply solenoid may have failed. You didn't provide the model fridge - so I can't give specific info about it - but many fridges have one or two solenoids at the rear of the fridge for water supply and ice makers. You should hear a clicking sound from the rear of the fridge on many models when dispensing water or when the ice maker cycles on. If one has failed, you may expect to pay about $15 to $50 for a replacement - depending model.
Typical GE Refrigerator Single Solenoid Water Inlet Valve "WR57X10033"Solenoid valve replacement is pretty straight forward. Usually all the is needed are some simple hand tools and a rag to pick up spilled water. Make sure the water supply is shut off and unplug the fridge before attempting.
If my answer was helpful - please rate it. Thanks & good luck!
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