replacing power supply, missing plug?

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?

E
eliwilAsked:
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CallandorConnect With a Mentor Commented:
Unfortunately, HP used proprietary power supplies in their PCs.  This one is designed to work: http://www.directron.com/m6320.html
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LysandusCommented:
You bought the wrong one.  There may be an adapter but I have never heard of one.  You are better off finding a power supply that matches exactly.
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