I have HND in mechanical engineering and I'm about to finish my NYSC, I need some advice. Is there any way i can switch from mech. To computer science or comp. Enginrn without having to go through under graduate studies again i.e, can i be admitted for PGD in the two courses i listed above?

Also I want to know if there is any school selling PGD forms now and the estimated cost of the program. I'll greately apreciate it if anybody can assist me in this regard.