Video games and my comcast cable box (motorola)?

My house recently got this comcast cable box installed for standard cable. i cannot get my gamecube to work now though! does anybody knwo how to fix this? i've plugged it into the box and my vcr and nothing works! i've hit all sorts of buttons and power combinations. would a digital av jack work (i'm not sure what that is but my gamecube has a jack for it) it uses the stand av chords red yellow and white. please note that they do NOT plug into the tv otherwise i would have done that...it always used to work through the vcr and i would just hit input onmy remote but input on this comcast remote doesnt do anything
 
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