Jittery Wavering Movement On Screen

[Guest]

Occasionally I get a wavering, jittery movement on my screen as I pull my
mouse pointer across it. This can be whenever I'm online, or even working on
a document. It has been ongoing for over a year now, but only happens on
occasion. Can anyone tell me what might be causing it?

It reminds me of a "nervous twitch" & just bewilders me!!!!

 

[Guest]

Have you tried lowering, raising your screen refresh rate? You can do this
on display properties, setings, advanced, and click on the monitor tab. By
default, 60 Hertz are selected. Beware, if the screen is set to a higher
refresh rate, than its native (default refresh setting) will lead to hardware
problems. Read the document information that came with your monitor about
its native, or recomended screen refresh rate.

 

[Leythos]

Occasionally I get a wavering, jittery movement on my screen as I pull my
mouse pointer across it. This can be whenever I'm online, or even working on
a document. It has been ongoing for over a year now, but only happens on
occasion. Can anyone tell me what might be causing it?

It reminds me of a "nervous twitch" & just bewilders me!!!!

Typically it's due to Electrical interference, and it's not seen as much
on LCD panels.

If you have your monitor near a motor, a transformer (like a florescent
ballast), or near some forms of transmitters, you can see that.

Many times you can switch to 70hz or 75hz or even higher and the problem
will disappear - it could also be bad power.

 

[Lem]

Typically it's due to Electrical interference, and it's not seen as much
on LCD panels.

If you have your monitor near a motor, a transformer (like a florescent
ballast), or near some forms of transmitters, you can see that.

Many times you can switch to 70hz or 75hz or even higher and the problem
will disappear - it could also be bad power.

IMO, one of the worst offenders in terms of EMI is Blackberry. Not only
do Blackberries emit EMI that causes "wavering, jittery movement" on CRT
monitors, you can also hear them buzzing on speaker phones and cordless
phones. If you have a Blackberry, keep it at least 6 to 10 feet away
from your CRT and your cordless telephones.

 

[Guest]

I don't have a Blackberry, nor is my computer near any florescent
bulbs-transformers, motors, etc.

As I mentioned this only happens on occasion, and it's almost like if I drag
the pointer across the screen, the movement comes with the pointer.

 

[cquirke (MVP Windows shell/user)]

On Mon, 25 Sep 2006 12:37:02 -0700, Elsie

I don't have a Blackberry, nor is my computer near any florescent
bulbs-transformers, motors, etc.

To that list, add powered speakers and wall-warts (power supply units)
for DC-powered peripherals.

You may also see this progressively as capacitors on SVGA or
motherboard start to die, but it's not usually limited to using the
mouse alone. This is one of the best outside-the-case cues that the
caps are bad, in systems with integrated graphics.

As I mentioned this only happens on occasion, and it's almost like if I drag
the pointer across the screen, the movement comes with the pointer.

If the effect is only clustered around the mouse pointer, then it's
more likely related to graphics and mouse drivers, or failing graphics
hardware. Try dropping the graphics acceleration down by one notch
(that changes how the mouse pointer is managed) to test.

This would normally be a pixellated effect, unlike the analog-level
waviness you'd see with interference and bad caps.

Another anomaly is a "ghost" around the pointer, that happens when
graphics drivers are used to change the display gamma, brightness etc.
The management of the mouse pointer disregards these adjustments, so
it's again worth testing by dropping one acceleration notch.

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