A total lack of water pressure or flow when attempting to refill a toilet tank is typically caused by a fully closed or broken individual supply shut-off valve behind the toilet, a heavily clogged toilet fill valve assembly packed with pipe sediment, or a closed main water shut-off valve. If other fixtures in your home have normal pressure, the restriction is isolated to that specific toilet's supply line or shut-off valve. Verification: Unscrew the supply hose from the bottom of the toilet tank, hold it over a bucket, and slowly open the shut-off valve to check water flow.
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