If your toilet won't flush and you have confirmed the bowl and trapway are completely clear of clogs, the issue is entirely mechanical within the tank. Remove the tank lid and check the flush chain; if it is detached, snapped, or too loose, reattach it to the trip lever arm so it lifts the flapper. Next, check if the fill valve has failed or if the water level is too low. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when reaching into tank water. Verification: Manually lift the flapper to confirm the toilet flushes and empties correctly.
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