I am assuming you are playing on a real centipede arcade cabinet. Props to you. I am guessing you have a monitor problem, and you will need help troubleshooting it. Get some tips here: http://www.arcaderepairtips.com/2009/06/27/troubleshooting-monitors-with-michael/
Do not try fixing this yourself if you are not familiar withit . Do some research in your area to find an arcade game repair person or call someone at a TV repair shop.