If it was the video card, it would have been obvious on the old monitor
also.

The original poster doesn't say, but implies that he just bought the MONITOR
(not the whole computer); thus I am assuming he had a different monitor
working OK previously.

If this is so, a quick test by swaping back to the original monitor will
verify. Apologies if I've misinterpreted.



"Jeff Rigby" wrote in message
...
I had vert lines in my monitor using a video card (I can't remember the
mfg.) It was the video card. Replacing it fixed the problem. Lines
showed
up with different symptoms at different refresh rates. I assumed it was a
cap on the video card. Bad cap in the power supply (powering the video)
in
your monitor can cause the same problem. The regularity of the lines you
describe make me think it's the video card not the monitor. vert lines
from
left to right should not be the same intensity or as sharp as you travel
across the screen.

"Craig Hart" wrote in message
...
At a guess, your monitor simply has multiple faults in the power supply
area.

The faults simply mainfest differently at different refresh rates.

Either junk it, or have it professionally fixed.


"Wizard of Ozz" wrote in message
om...
I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very
old computer, with a very old video card, a SiS 6326 (Silicon
Integrated Systems) from 1997. I'm using Windows 98.

I installed the appropriate driver that came with the monitor CD.

I have read the entire FAQ at www.repairfaq.org and my problem didn't
come up.

When I had the display at 800*600 with 75 Hz refresh rate, there was a
linearity problem. The 2 inches closest to the right and left of the
screen were slightly compressed. Barely noticeable by the naked eye.
By measuring the distances using a gif image with evenly spaced lines,
I calculated the difference (from the center screen) to be between
5-10 %. In the FAQ it says that cheap monitors can be expected to have
up to a 2 % difference in linearity (I take this monitor to be on the
cheapo side). But I solved this problem by changing the Hz rate. And
that's where my real problem comes in.

After reading the monitor CD manual to make sure I wasn't doint
something I would regret, I manually changed the refresh rate to 85 Hz
(always at 800*600). Perfect! Beautiful image. Except...

There are these evenly spaced vertical lines, just noticeable, across
the screen. Others might not complain about them. I'm a perfectionist
(there's a bit about perfectionists in the FAQ). There's 7 of them.
They weren't there at 75 Hz. Very evenly spaced, about 4.2 cm apart
(1.65 inches). They are each 1 mm thick (0.04 inches). They seem to be
slightly brighter than the sorrounding picture. On a black image they
don't appear, but on a uniform image of white, red, blue, or green,
they do. When viewing text, I can't notice them, though they still
appear in the blank parts of the text screen. They stretch from top to
bottom. The 2 closest to the left and right side of the screen are
about 2 and 3 cm respectively from the edge of the screen.

If I move the screen using the controls on the side of the monitor,
the lines move with the screen.

The image, otherwise, is absolutely perfect, beautiful, perfect
linearity, colors absolutely perfect, no strange noises, no problem
anywhere whatsoever.

One possible factor I noticed in the FAQ which might apply: most video
cards and monitors use 75 ohms, but older stuff might use 50 ohms, and
this could cause an impedance mismatch. The video card is old, from
1997.

Thanks in advance for any help.

P.S.: one final off topic query while I'm at it. The specifications on
the CD manual said the monitor had presert timing modes for vertical
frequency of 75000 Hz at VESA 640*480, and 85000 Hz at VESA 800*600
and VESA 1024*768. Sorry for the stupid question, but does this mean
the monitor will blow up if I change the desktop screen resolution
from 800*600 to 640*480 without first reducing the refresh rate to 75
Hz? I read in the FAQ that modern monitors automatically block any
signal which is incompatible with their hardwired specs. As I read
this I couldn't help but wonder: what a brilliant tactical move,
allowing your clients to live so they can shop again another day !
Pure genius! And it only took them 20 years to think of this! [Irony
off]