one driver must go down help

i have this problem with drivers
at first my printer work couple times
and
suddenly one of the drivers gets hot (the extruder driver ) when i connect it and does not work
i get another one and tried again
the same happened to X axis driver i take it out
and put it alone without the other driver
still gets hot
i tried the 3 other driver they work
why this happened when they are 4 ?

Hi, posting the same topic in three subforums is not wanted ( [forums.reprap.org] )

I suggest you first try to compose a better question and then not put a copy in three different subfora.

One question, do you have cooling elements on your drivers, and do you have a cooling fan pointed at those cooling elements?

---

http://www.marinusdebeer.nl/

I did not know in which section should i post it
yes i have
they are all cold except one must get hot

we made a printer before and it was working
and this is the second one and also was working
suddenly this happened :\