Hey everyone, I'm having some quick trouble. This is my second PSU I think I fried. It's a standard 110v->12v. I have one of the 12v and ground leads hooked to a relay. Would not having a diode across that relay fry my PSU? Also, which way do I install the diode? So the white bar goes towards the positive? Also, what type of PSU is it?

The main motherboard connector is one big plug - 2 rows, and about 19-15 columns. Any idea?