Williams Defender

[Mooch]

I have a Williams Defender Upright. Every time I try to go for screen sync to centre the screen I get a jaggered spike from the bottom left hand corner going diagionally to the top right corner. The screen then starts rolling. Anyone help please?????

 

[Lavarin]

Errr mind posting a screenshot of what you see? (Print+Screen to copy, then paste in Paint to save)