heat bed and extruder
Prusa i3 P802D/S using a Melzi board.
I have been using this machine for about 3 weeks now with out any problems other than learning the process.
Today while printing for about 3 hours on various experiment designs, for no apparent reason the heat bed and extruder refused to heat up.
I checked voltage to melzi board and it was ok. Also reloaded Repetier software.
Every else seems to be working ok.
I can switch the heat bed and extruder on and off but nothing happens.
Has any body got any helpful clues for this old bloke?