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screen jitters

O

omegaX

n00b
Joined
Jan 1, 2005
Messages
13
I recently built a new computer and the display ran fine on a 20" crt with 1600 x 1200 resolution over vga. Now i switched it to a 20" widescreen monitor running 1680x 1050 (monitors native resolution) over DVI. Now the display shifts to the left about 1/8 of an inch then back quickly sometimes when i bring the mouse to the left side of the screen, and keeps doing it when i play video. It very annoying any help would be appreciated.

The card is a EVGA 256-P2-N735-LR GeForce 8400GS, the monitor is optiquest Q20wb and i installed latest drivers and hotfixes for vista.
 
The new display might have a fault.
Have you tried it on another PC or with different connection methods.

Its possibly the cable.
Can you try another cable.

Have you tried a different graphics port on your card?
Its possibly a bad connection or a faulty port.

The way your mouse interacts is odd but it reminds me of an old issue where the mouse can cause sound to come from the speakers when it moves.
This is due to EM radiation being picked up by the sound circuits.

For this to affect your video connection in the same way, you either have a bad connection, the earth connection on the cable has been broken so it is is more prone to EM radiation or your graphics card is picking up excessive EM radiation from inside the PC.

If you need something more to try you can test if the graphics card is picking up interference.
Get some fine wire mesh and create a shape that will fit over your graphics card. Coat it in plastic or cling film quite thickly so no metal is exposed and so no pointy metal contacts can penetrate.
Fit it over your card and see if the situation improves.


Hmm, I just thought of another.
In the CMOS is a setting for spread spectrum.
Whatever it is set to, try the other setting.

What this setting does is try to equalise the amplitude of each EM frequency that is coming from the PC so no frequency is excessively high. It can give a minor performance decrease.
This setting is used so PCs can pass EM emission regulations when used in spread spectrum mode.

Setting it to spread spectrum will make some frequencies stronger and the peaks weaker.
Setting it to not spread spectrum will do the opposite but again results in some frequencies getting stronger and others weaker.
If certain frequencies are causing your problem, changing this setting might make enough difference.
 
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