hey there, I found out that, if you havent set the xbox or ps3 to the exakt specs from the card’s capture program it wont show anything in the capture window.
I dont know if this helps, but make sure u got the exakt same resolution and fps settings.
so my workflow is: hook the box via component to the tv, set it to 720p (or whatever you want), than adjust your settings from the capture program to the same, plug the cable fromn the tv to the capture card and reopen the captureprogram till it gets an image.
connecting via hdmi might cause the xbox to re-adjust the settings to something different. it can not sense the outputchanges via component since it’s analog…no expert, just guessing.
good luck!