For the computer saavy, please help?

I have a problem.

This morning, when I was getting ready for work, I was trying to upload some new music to my iPod. I connected it to the firewire connector and it didn't work like normal, so I looked at the connector and saw that there was a fair amount of dust/whatever in it, so I thought that must be the problem. Now I tried to get the dust out of the connector when something happened.

There was a spark, and my computer shut off immediately.

I felt so stupid for not disconnecting the firewire connector first before trying to pry the dust out of there, but now I'm faced with the problem that my computer just won't turn on. The spark in question did not come from the computer end however, it came from the connector end (the part I was fiddling with), which I *think* leaves me a few possible ways to fix the problem

1) The Power Source got fried, and replacing it will solve the problem
2) The Board fried, and replacing the board and processor will solve the problem
3) Both of the above
4) Computer busted, must replace whole damn thing.

My question is, which of these seems to be the most likely solution to the problem? Is there anything I haven't thought of?

Jam it back in, in the dark.

The firewire port is in the front of the computer, does that mean it's connected to the board?

There's nowhere I can't reach.