Why a "shadow" effect on an LCD monitor?

I have two Acer 24" LCD monitors for my laptop, one at home and one at the office.  The office monitor sometimes shows a dark 'shadow' effect to the right of both text and graphics.  The home monitor is fine so it can't be the computer.  Any ideas as to what's causing it, and whether it can be fixed?

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VGA is an analog technology, making it susceptible to electromagnetic interference and signal losses.  The cable on your office computer might either be too long, not shielded heavily enough, or running parallel to power cables or near some source of interference.  Solutions include purchasing a (more expensive) heavier cable that is as short as possible, and then playing with the positioning of the cable so the ghosting disappears.

If you cannot avoid placing the cable near other cables, try not to run it parallel to those cables; instead, placing them perpendicular to each other minimizes interference as it causes phase cancellation and there will be less length where the interference can "jump" from one cord to the next.

That was it! just moved the cables a little.

Prfesser (author)  MahavishnuMan6 years ago
That sounds like a reasonable solution.  I will play around with the video cable.  Thanks!
GigG12 months ago

I had the same problem. Turned out it was the VGA cable I purchased a 10' long cable from ebay and for whatever reason it caused the shadowing problem. I replaced the cable, problem resolved. Hope this helps

xana6 years ago
sounds like a burn in look it up on google.
What operating system are you running?
Prfesser (author)  The Ideanator6 years ago
Vista.  I can't see how the operating system---or for that matter, anything about the computer---would make a difference, considering that one monitor works fine and the other (identical make and model) does not.  But maybe I'm wrong...
If its on in one computer and off in another, its not the monitor. There are bound to be some settings somewhere on the computer or monitor that will turn it on or off.
Prfesser (author)  The Ideanator6 years ago
It is the same *computer*, connected to one (external) monitor at home, and an identical (external) monitor at the office.  The laptop's built-in screen is used only when I'm traveling.