Make sure the lid is completely closed. Certain parts of a wash cycle will not start if the lid is not closed.
Check the load to see whether it is unbalanced. If the washer gets off balance, it may stop in the middle of a cycle. Redistribute the clothing so that it is evenly balanced around the drum.
Make sure the hot and cold water faucets connected to the washing machine are turned on fully. If the washing machine is not getting enough water, it will not be able to complete the cycle.
Inspect the drain hose for clogs or obstructions. The washing machine may stop if it is unable to drain water properly. Check the drain pipe that the hose feeds into for clogs or debris.
Check the house's circuit breaker panel or fuse box. The circuit may have been tripped or a fuse may be blown. Replace any blown fuses and reset any tripped circuits.