Re: horizontal display streaks.
For a "regular" CRT monitor, it looks like a bad drain line. Try another VGA cable if there are not any bent pins, or another monitor if the cable is fixed to the back of the monitor. You may also want to try just slowly moving the cable around while avoiding straining it any further. If you're handy (and don't have a choice), you can try re-terminating the VGA cable.
I hope that helps you.