Assuming no one has turned off the cold water tap, the problem is most likely the water inlet/fill valve.
Its the piece your hot and cold water hoses fit on to.
This piece has 2 valves in it to allow hot or cold or both (warm)
water in.
Hot setting: hot side opens.
Cold setting: cold water side opens.
Warm setting: both sides open.
Fairly inexpensive part just call Sears and have your model #
handy (its located on the machine in the door cavity on a mettalic tap. Probably starts with 110 or 970 )
Chris, December 2005