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Has anyone had a case of horizontal lines on the monitor screen? It is not the monitor, as connecting the system to another monitor it did not go away. So it must be the graphics card, but does anyone know what to chek next?
What happens when you switch to the console mode (ctrl+alt+f1)? If it's OK, there's something wrong with your X settings. I suggest you to install xvidtune (not 100% sure it's the correct name) and use it to test diffeent settings (small steps). Yoour settings are close to good, but the values are not what they should be.
Thanks for the suggestions! Unfortunately I don't think we're quite there yet.
Now, console mode does not change anything: The lines are still there. Second, I did not change anything in view of the resolutions. This was a WORKING installation that decided to have this behavior after a power failure and no, the lines are not moving up and down. These are fairly fuzzy horizontal lines.