> From:    raymond kornele <[log in to unmask]>
>
> >From: Robert Bowen - Information Services - SUNY Farmingdale
> ><[log in to unmask]>
> >Subject: [PCBUILD] Yellow Vertical lines on monitor?
> >Date: Tue, 3 Aug 1999 18:12:04 -0400
> >
> >Hello all,
> >
> >I have a problem at home on my PC.  For the past day or two I have been
> >getting vertical yellow lines on my monitor.  Could this be a video card
> >going bad?  They seem like interference, but I can't trace the source, and
> >nothing has been added to my PC or the area around it recently.
> >
> ===============
> It could be interference from a neighbor's new PC or TV or ham radio coming
> in on the power lines. If this is the case you may need to filter the power
> lines. Such filters are not expensive and often are built right into the
> surge protectors (I hope you have one of those).
> =====Korny=====
>
> From:    Max Timchenko <[log in to unmask]>
>
> Hello Robert,
<SNIP>
> Have you tried another monitor and/or card?

Several possibilities come to mind:
1. Interference from other equipment.
2. Defect in video monitor.
3. Defect in video card proper.
4. Defect in Video RAM (VRAM).
5. Corrupted video driver.
6. Something on the rest of the computer, such as bad RAM.

If the vertical yellow line is completely stationary, # 1. is unlikely.
(The source would have to be perfectly synchronized with your PC - but
it could come from something within the box.)

Substitute a known good video monitor.  If it shows the same problem, your
monitor is OK. (Note, you may have to adjust settings if the monitor is
not the same type - and this could change the picture.  Try to use the
same settings.)

Substitute a known good video card.  If this fixes it, then the problem is
on the video card.  If the problem persists after changing both monitor
and card, it is probably a software problem like a corrupted video driver,
although there is a possibility that something on the motherboard, etc.
is interfering.  Re-install video drivers from original floppy that came
with the video card, or download from the manufacturer.

(This is not the sort of problem that could be caused by the cable to the
monitor.)

If the problem is on the video card, and some of the VRAM is removable,
try swapping in known good VRAM (of the same type), or switching positions.
If this changes the picture, then the problem is in the VRAM.

While the box is open, take the usual precautions.  Unplug, to protect YOU.
Keep one hand on the shiny metal of the power supply, or use a grounding
strap, to protect the components from static.

Boyd Ramsay

[log in to unmask]

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