My Dell monitor has been working fine for years, and now suddenly the images and text are blurry and there is a shadow next to everything.
Jnanda,
Could be one of two related situations both have to do with built up magnetic flux:
!. If you have used the monitor for a significant amount of time and have never degaussed it that might be it.
To fix: Go to where your monitor's controls are (eg screen size/position, Brightness, Contrast, etc.). Providing that we are referring to an older style monitor (like a TV) and not a flat screen, you should find a degaussing button located there. This button is marked with a depiction of a horseshoe magnet. Press it.
If you have on screen settings control, hit the menu button and select the icon that looks like a horseshoe magnet.
You'll hear a buzz and the screen will go kooky for a moment.
You're then degaussed. Your problem should go away.
2. You may have moved the monitor close to a source of electromagnetic interference (or vice-versa) this will also cause that sort of thing you describe (remember that there are electrical lines in the walls (another source of EMI)
In that case move the monitor away from the EMI source or move the EMI source away from the monitor.
Remember that it could be both 1 and 2. So if the problem lessens but does not go away fully try both steps.
SIMPLE !! The "shadowing" you talk about is due to cables in back of your computer, touching or too close together. I had this happen to mine. I moved the cables apart, and no more shadows !! Sounds too easy, but it works. Takes a few seconds. Immediate results.
Check the VGA plug and lead between the monitor and computer.
Does it get worse or better while you move the lead around?
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Is this an LCD monitor like the heading says, or a CRT type? What is the actual monitor model number?
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