I have my 20" Mac multisynch monitor attached to my PC using one of
the hd15 vga male to db15 mac female adapters. All works fine at lower
resolution, but if I  increase resolution to 1600 x 1200 - the monitor
goes to sleep. I know the monitor can do the resolution because it has
worked fine on another computer.
I searched far and wide for the pin allocation of the hd15 vga
standard and figured that I just would disable the "sleep-pin" but I
can not find any documentation on the web.

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Request for Question Clarification by aht-ga on 19 Mar 2004 10:40 PST

It may actually be that your video card is defaulting to a scan
frequency that the monitor will not support at that resolution. Have
you tried adjusting the output frequency in the PC's display settings?

aht-ga
Google Answers Researcher

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Request for Question Clarification by techtor-ga on 20 Mar 2004 21:32 PST

Can you tell us the hardware and software specs of your computer
compared to the one the monitor worked on? Perhaps there is a
different setting or part in the hardware or software configuration
that's causing the sleep at high resolutions.

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Clarification of Question by nielsck-ga on 22 Mar 2004 06:46 PST

aht - 
problem solved !!!
When I lowered the frequency to 60Hz the monitor took 1600x1200. It
still does not take the 1800x1440 that the card can do, but then I
guess it is because it does not allow me to set the frequency lower
than 60Hz. But hey- I am happy.

This is running Xandros Linux 2.0 on an E-machine E-tower 600IS.
Please convert your clarification-request to an answer. 
Thanks again
Niels

nielsck-ga:

I'm glad to hear that your monitor is working now on your Linux machine.

You described your monitor as a 20 inch Macintosh Multisync. Now,
'Multisync' normally implies an NEC product, but I'm thinking that you
may actually be referring to an Apple monitor. If so, then your
monitor will appear on this list of Apple monitors:

http://docs.info.apple.com/article.html?artnum=15087

The only 20 inch CRT models are the M1823 Apple Multiple Scan 20
Display (Rev A and Rev B), and the M3703 ColorSync 20 / Applevision
850.

As well, it is possible that you have the M6204 Apple Studio Display
21" (19.8" vis). This is the blue and white model.

The specifications for the three models are available as well:

M1823 Apple Multiple Scan 20 Display
http://docs.info.apple.com/article.html?artnum=112531

  Maximum resolution: VESA 1280x1024 75 Hz (vert) 79.98 kHz (hor) 88 dpi

  (This is most likely not the one you have, as Apple does not claim
better than 1280x1024 performance)


M3703 ColorSync 20/ Applevision 850
http://docs.info.apple.com/article.html?artnum=15881

  Maximum resolution: VESA 1600x1200


M6204 Apple Studio Display 21"
http://docs.info.apple.com/article.html?artnum=43129

  Maximum resolution: VESA 1600 x 1200 85Hz (vert) 106.25kHz (hor) 


In any case, there is a high likelihood that an 'older' monitor was
not designed with a high refresh frequency capability for the maximum
resolution. In most cases, you should be able to run at 60 Hz;
however, in fluorescent lighting this will give the screen a
noticeable 'flicker' or strobing effect. It is a trade-off between
putting up with that, or going to a lower resolution at a higher
refresh rate.

Hope this helps!

Regards,

aht-ga
Google Answers Researcher

Great help !! I would not have figured this out alone. Thanks