Check everything as VHG says above, if still no luck then pull machine out, locate the tap(s) at the supply end of the water hoses and turn off, undo the hoses from the back of the machine (being careful not to lose the rubber washers) and place them in a bowl, then turn the taps back on briefly.
If you get water through the hoses you know that the water supply is ok and it's a machine fault. if it is a machine fault it's very likely to be the water inlet valves, this can be checked by seeing if there is mains voltage across the valve with a test meter at the point when the machine is meant to let in water.
If it is the valves these are a fairly cheap part (15quid) and easy to fit.
http://shop.ezee-fix.co.uk/Indesit_Washing_Mac hine_Valve_Spare_Parts_4009.html