How To Fix A Cord Myself When The Cable Guy Cut The Cord Video Wont Come Thru On My 360 I Bought A New Cable Cord?

Video wont come thru on my 360 i bought a new cable cord? - how to fix a cord myself when the cable guy cut the cord

PPL still dosent work and said it could be the video chip is something we can fix it Where can I take if I did. the sound just fine