No place for 3-pin connector on PC cooler?

I've had over-heating problems for a while. My solution has been just to keep the desktop's case open, and when appropriate, I've used a small external fan to cool it down further. While that works it comes with an increased noise level, so recently I ordered an EverCool PC Air Conditioner that fits into a standard drive bay. It came with a 3-pin power connector, but the only place I can see on the motherboard that would accept such a fitting is taken up by the CPU fan's power attachment. There are other pin clusters that I could sort of plug it into, but I assume that would be bad.

What's the appropriate solution? Can I run this thing off a battery, or some other external power source? How?

I've included a bunch of pics of my motherboard in case anyone here can see a solution. And while I'm here, any tricks to getting all the dust and goo off besides old fashioned wiping and cans of compressed air (Dust-Off)?

 

More pics...

 

And just for good measure:

 

update: turns out my hp pavilion 511n did have more than 1 3-pin receptor; it has three of those receptors in fact, of which one was free. I think you can see them (or just one of them) in the last pic behind the RAM cards and above the IDE connections.

The fan is on now, and so far so good i.e. low (added) noise level, and so far temp has risen more slowly than and and it seems to have topped out at 46C for now at least; before it went easily above 50C.

I found this out by using HP's free support chat. Good customer support!

 

Just saw your thread, glad you got it figured out. There are 3 pin to molex adapters available if you use all the ones on the mobo.

E

 

The last time I was in an HP/COmpaq there was one connector down past the last card slot near the bottom edge of the mobo. But it was speed controlled and hardly let the Zalman F2 run that I tried to install, so I pulled it back out.. The owner wasn't having overheating problems anyway.

.bh.