video interference?

jdow jdow at
Wed Feb 20 00:51:10 UTC 2008

From: "Frank Cox" <theatre at>
Sent: Sunday, 2008, February 17 08:39

> 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.

Hum bars. That suggests an overloaded computer powersupply or that the
monitor powersupply is about to die.


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