It may have an air lock in the supply hose or when the water supply returned it may have tripped the pressure sensor in the fill valve, if it has one.
Unplug the dishwasher.
Turn off the water supply to the dishwasher.
Remove the fill hose from the rear of the machine and put the end into the sink or a bucket and then turn the water back on for a few seconds.
Reconnect the hose, turn on the tap and try the dishwasher.
Jeffers
January 2010