Matrox G550 not working

I have been using a Matrox G550 dual monitor display card for a few years.
The other day I booted up and all I can get is the mouse pointer. Nothing
else shows on the display. I installed the G550 in another computer and it
worked fine. I also installed the old single monitor card and it works as
well. Why would my old display card work and the G550 just show me the
mouse?

Thanks
Kenn

 

My first thought would be an undesirable interaction between recent Windows updates and the drivers or accessory software that control the card.

You could test that by using system restore or a drive image to go back to a point in time before the problem appeared, or uninstall the updates and see if that resolves the problem.

You might also try changing the settings for resolution, refresh rate, etc. to the safe native default for the monitors, and test the monitors one at a time on each of the ports.

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If me, I would swap in a known good power supply and see what happens before doing anything else.

 

I am thinking it is a software update. It can't be worked on when the card is installed
because there is nothing on the screen. I will need to install a single monitor card and
then try and remove some up dates

 

I don't see this being a software update problem, unless you just applied the update and it failed immediately after that. But if it works with your single monitor card, you could install that, then uninstall the Matrox drivers and start from scratch installing that again.