i have a mark 6 ford escort cabriolet and the power roof is not working the previous owner said the pump was new but it dont work no noise comes from pump at all any ideas?

I'm sure there is a switch/lever on the pump that can be turned into manual mode. Has this been turned? If not check for power at the switch, if there is power there check that when it is pushed you have power to the pump. Also check the fluid level.