Vertical light grey bars?

[Bobbler]

Well today I got my ArcadeVGA so have been doing some playing on the monitor in the cab. One thing I have noticed is that there is sort of patchy grey vertical bars on the screen at any resolution. They persist when I remove the video cable.
I can sorta combat it by turning the brightness down but then I find some games with dark areas are a bit hard to see (especially when you add the tinted glass into the mix too!)
Do any of you guys recognise the symptom at all?

[grantspain]

some sort of chassis ground problem or caps if its jailbars

[Bobbler]

some sort of chassis ground problem or caps if its jailbars

Will have to double check the grounding as I removed a lot of (rather tattered) the original wiring when I did my conversion. I am hoping I just need to add a ground feed to the chassis to the ground of my power feed.
Caps is not really something I want to mess with because of the need to discharge the monitor. Just dont see the point in risking it when a replacement monitor is only a little more than the amount of a cap kit and the time to do it.
Thanks grantspain

[hammad]

This problem is because of your flyback so you should get it checked.