A question about repairing a machine

[MarioAllStar2600]

This seems pretty simple but I have never worked on a machine before.

"The game was working fine, then one day we plugged it in and the screen was acting up. was told it may need a cap kit. The figures were trailing images"

What does this sound like to you? Also how much would it cost to repair?

Thanks in advance.

[Time]

Need more info. What game are we talking about?

The graphics were messed up or the monitor seemed to have a problem?

[xertcev]

Before you do anything, read up on your monitor safety.
Here's a link with the basics, There is a Cap Kit tutorial about
half way down too.

http://www.arcadecontrols.com/arcade_monitors.shtml