GFFX 5700 Weird Video Distortion

I have the 5700 256mb ddr card in my computer.  I had 5200 128mb card prior and had the same issue.  When the video is at its default settings, like when booting up, you can see a wave going up the screen continuously.  Almost as if looking at a monitor through a video camera.  It is only slightly noticeable, but very annoying.  The only way I have been able to live with it is to change The display timing from within the display options to GTF.  This keeps the video in check, however, it does still act up in certain games where the resolution is different.
Originally I thought it was my video card so I went to the 5700.  Same issue, so I just upgraded my mother board to the 865GM2-LS and I still had the problem.  I then replaced the Power supply, and to no avail.
This is driving me nuts, can any body help?
I did try a different monitor and removed all objects from around the monitor and computer.

Hi
Sounds like you've got a hum bar. It's the video equivalent of a "ground loop" hum you get in audio signals, and will move at a rate which is the difference between the display vertical frequency and your power line frequency - if they are both nominally the same (e.g. 60Hz), the bar will move slowly, as the frequencies won't be exactly the same.
If you are going into a TV (or VCR etc.), try disconnecting the antenna or cable feed and see if it goes away. You could also try disconnecting any other devices, especialy ones with grounded power cord connections, and seeing if the problem disappears.
There is also a slight possibility that your PSU is causing the hum, as it probably is a little low powered by current standards.
Cheers

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