Hi; Man Oh Man. I was contemplating buying a new monitor until your posting showed up. I have exactly the same problem. I started about 10 days ago on a 5 year old 19" CRT Compaq V90 monitor that has never given me problems before. On Sun, 2008-02-17 at 10:39 -0600, Frank Cox wrote: > I'm starting to think I have a different problem with this computer, that's not > operating-system related. > > I occasionally have slowly-moving horizontal lines on my monitor that show up > on the lighter coloured parts of my screen and travel upward. It seems to come > and go, and looks for all the world like electrical interference. The lines are > very small, maybe 15 per inch, and are mostly visible on the top half of the > monitor. On a smaller monitor I might not even notice them, but on this 22" > wide screen monitor it's distracting. > > I moved the computer further away from the monitor and changed its orientation > but that didn't change anything. I also tried plugging the monitor and > computer into different/separate electrical circuits and tried it without my UPS > as well. > > Is there anything else I should be trying? I'm running out of ideas. > > -- > MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com > Your post has given me hope that I can adjust this problem. Just to compare notes: 1) The interference lines (exactly as you describe) started about 10 - 14 days ago, 2) They appear in both Fedora 8 and WindowsXP (I have a dual boot) 3) They are accompanied by an interference noise coming from the monitor -- but only when the screen is not blank (black) 4) I have tried to adjust the monitor buttons to no affect 5) I have looked for a new BIOS download for: M2NPV-VM Asus motherboard M2NPV-VM ACPI BIOS Revision 1001 Chipset: C51PV-MCP51, 06/21/2007 BIOS Type Award BIOS size 512 I have only found a BIOS revision 1201 at the ASUS.com site and I am not sure whether this is applicable or worth exploring further. 6) I have not yet tried the monitor on a different machine that I have here (Ubuntu) Frank, if you have any additional suggestions I would appreciate hearing them. A new good monitor would cost about $300 and if the problem is elsewhere (like needing to update my BIOS) that would be a complete waste of money. -- Regards Bill