Are you referring to the Power Supply? Or the Video?

Video is S-Video out and converted to RCA composite video.
Power Supply is a PicoPSU.

I meant, what is the connector that you used to connect the power/reset button to the motherboard?

Oh, well if you read in my earlier post when you asked me about those.......I already answered that...............................................

I used the typical jumper like switch connectors you use on all standard motherboards to connect the power/reset switch that come with most computer cases.

Essentially like this, plugs into the prongs on a motherboard, but the one I used does not jump the 2 connections together. It has wires fed to both connections and to the temporary contact switch.

thanks! Sorry 'bout that! I guess I didn't read it thoroughly enough.

What did you attach the A/V cables to? was it an adapter that connected to the s-Video port?

Ya, i picked up a S-Video to Composite Video adapter from radioshack and rigged it to the AV ports.
But i needed something slim to fit between the mobo's port and shell of the NES, so i bought a male connector and wired it in without housing.

Do you have a picture of what that whole connection looks like? Sorry if I'm pestering you too much but I want to make my own NES PC and this post really helps.

Sorry no, I'll see if i can snap a photo later.

I'm also doing this project. I'm ordering parts soon, all ready gutted out my NES and cut and re-soldered the board with the power switch and light. Gonna fit an ION 2 Mini-ITX mobo and maybe a Blu-ray player in there (at least something that can burn DVD's). Borrowing my friends dremel soon, cant wait to get it up and running

Will make my own thread so I don't pollute yours

That's ok its generally dead in here