Secondary monitors turn off when opening DOS Window

September 12, 2012 at 07:49:08
Specs: Windows XP, 2.4 GHz P4 / 512 MB
I have a system running Windows XP SP3, using a Matrox G450 4-port video card. When I switch to a DOS command prompt to runs some older software, the second and third monitors power down. I would prefer that this not happen, as I sometimes am in the DOS mode for only a few seconds, and the rapid power cycling cannot be doing the monitors any good. How do I set things so all monitors remain powered up regardless of whether I am running "regular" XP or a DOS window? I don't mind if the secondary monitors go blank (or black), as long as they remain powered on.

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September 12, 2012 at 08:37:31
Monitors don't really turn off, they (even if power switch off) are really in a sort of standby. They always use power.

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September 12, 2012 at 17:12:47
No, they really turn off. They power down, and the CRTs shut clear down (not just blank). When I exit the DOS window, the secondary monitors power up, complete with the degaussing function. I agree that the monitors continue to use a small amount of power so they can respond to the 'turn on" command, but I am wanting to avoid the CRT shutdown and restart when entering or leaving DOS mode. The main monitor does not exhibit this action. I have all three monitors set to shut down after 45 minutes of inactivity, and that works fine, but the shutdown when opening a DOS window is instantaneous, and clearly separate from that function.

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September 12, 2012 at 19:39:16
I doubt that what you want is possible, I am sure that DOS does not support multiple monitors. DOS is probably running it's own built in VGA video driver and that has to override your XP driver while it is running.
This might not be the case if you installed a virtual machine within XP and DOS on that rather than XP's built in DOS, but I do not know for sure. I rarely used DOS back in Windows '95 days and that was always there in the background. About the only time I do now is if I boot from a bootable test utility.

You have to be a little bit crazy to keep you from going insane.

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