check wires on moving parts. you can have just a broken wire inside the insulation, as i did once. i had the same problem and it was in the conection betwen the psuply and the ramps i hope it helps.by OldRock - RAMPS Electronics
go to bq site (spain) search for prusa i3 get all the instruction manuals, they are devided by steps and in english and very explicit. you got there everything to construct your prusa i3 for the heat bed you will have in this forum all the help you need. i'm in portugal so i can't help you in person. i would if i could and for free.by OldRock - General Mendel Topics
bq prusa i3 hephestos is nice too. i got one.by OldRock - General Mendel Topics