I have a k7000 that recently starting jumping up and down. sometimes not that bad other times games are just unplayable. I have messed with the v and h hold but seems like thats not it. maybe a sync issue? any ideas?
Does it look like the image is changing its size? If so, maybe try turning the vertical size pot back and forth. I had a monitor with a dirty pot that I was able to "clean" by just rotating it back and forth a few times.