I'm replacing my first power supply...or trying to. The old power supply on an HP Pav 7840 has a 3 prong female plug that attaches to the mother board. The new power supply has no such critter alto there are 4 prong female plugs. The original is a HIPRO model HP-K1363a3. The new one is an Echo Star and matches the original plug for plug except that 3 prong one.
Did I just buy the wrong kind or is there some kind of adapter?