How can I fix my Diplomat Cooker model 050502015 serial no 20361038?

I went to put my oven on to do the usual cooking when I turned the knob to let the gas in and light the oven there was no automatice ignition sound and there is no gas being let into the oven cavity at all , also the display on the front of the cooker is not working It is completely blank , I also have a very strange loud humming noise when I turn on the gas cooker. The gas hob above is working perfectly. I have checked the plug and the fuses are all ok ,how can I fix this quickly.
thankou

Tracie Terry
January 2008