Hooking up a gaming console

So, I have a hp media center pc with a tv tuner card with all those accesories. My question is, how do I hook up a gaming console so I can record it onto my pc? I've looked around and found out that WMC doesn't even respond to it. I tried it myself; same thing. I know you would hook up the video cables to the input plugins, but my problem is that I don't know how to get my comp to recognize the input signal from the console. Plus, I've heard that using your comp as a tv screen won't work well, as there is a few second delay.

Help me out guys, I wanna make some machinima!

Come on, guys. Nobody knows how?