The 703 model will not loose all power just because something got knocked. There is no wire connections that could come apart or anything like it. Open the panel & make sure the power lead is plugged firmly in to the module & the display board is plugged in to the control module. Apart from that, there is not much else you can do except call someone in to test the control module to see if it is working.
Lincoln Appliance NZ, September 2009