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Odd display problem

Trish's Escape from Hardware Hell Help Board » Hardware » Video Related Problems » Odd display problem « Previous Next »

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Posted on Tuesday, July 8, 2003 - 9:01 am:   

I have a three year old 19" samsung monitor and a one year old msi/nvidia geforce4 mx440-T 64mb graphics card with tv out.
both have been working fine until recently. My usual screen resolution is 1280x1024 @ 85Hz.

(The problem occurs both under windows 2000 professional and linux suse 7.3)

Two days ago the display developed a series of vibrating blurry horizontal lines which can start anywhere on the screen and then progress to fill the screen so that you cannot read anything on the screen because of the wobble.
However, if i change the refresh rate and/or screen resolution to a different setting this cures it, for a short while usually about 5 mins or if im lucky its ok until i turn the computer off, but then it starts again. Not all refresh rates or resolutions fix it, some are worse than the original wobble/blur/vibration, so some times it takes me a while to find a stable screen.

The tv out is not being affected and as such i am using this to help choose what resolution/refresh rate to change to.

I have not bought or installed any electrical devices near by nor has any electrical wiring changed in the building. I have no cordless or mobile phones near by. Everything is in the position that they have been in and working fine for the last year.

Everything else in the computer is working fine.

I have tried reinstalling monitor and video card drivers and checked that all the cables are ok and that the video card is seated properly in the agp slot

the monitor is getting its power from the main cpu power supply - should i try to find an independent power cord? (but why would this be a problem after 3 years of working fine?)

Unfortunately i have no other monitor or video card that i can use to test.

do you think its a monitor or video card issue?, or is it something else?
any suggestions or help will be greatly appreciated
Posted on Tuesday, July 8, 2003 - 10:13 am:   

need more info... cpu speed, power supply watts, etc.i would try to use another source of power. you may have dammaged your video card.
Posted on Tuesday, July 8, 2003 - 10:56 am:   

thanks for the reply,

the cpu is an athlon 798, 384MB sdRam
power supply is 350W
MSI a6191ms motherboard
Posted on Wednesday, July 9, 2003 - 8:42 am:   

Since you can use the TV out to change the resolution and refresh rate of the monitor I would not suspect the video card at this point due to the fact that the TV portion is integrated into the Video chip on the card. What you can do is a monitor swap if possible just to rule out a circuitry problem in the vid card's digital to analog converter circuit.

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