Cannot select a program on my Bellling IDW450 Dishwasher?

Appliance had an overfill of water. When I pressed the power button it kept beeping but was draining water. I know this can be fixed by tipping the appliance over and draining the water as I have had this problem before and the appliance worked no problem. I did this but the problem now is that I press the power button, it beeps once and then I cannot select a program.