agp dual head card problem

[bradman666]

Hi, I am having a problem with an agp dual head card (matrox). My pc doesn't seem to notice it. The driver installer doesn't see it either. This is the first time that I have plugged anything into the agp slot. Any suggestions?
Thanks in advance, Matt.

 

[bcastner]

Check your BIOS to make sure that the AGP slot has been activated and given preference in use. Some will autoselect if the AGP slot is used, some BIOS's will not and require a setting.


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[bradman666]

Hi, Thanks for that reply. The mother board is an ASUS A7N266-VM. I have found the on board/agp selector in the bios. Unfortunately when I select agp I can't see anything on the screen!
Any other suggestions more than welcome!
Matt.

 

[bcastner]

You then moved the monitor logic cable from the onboard adapter to the AGP adapter? You tried both heads?


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Users Helping Users

 

[bradman666]

Yes and yes. Is there a way to tell if the agp slot is actually enabled at all? Should I see it in device manager. When I first had the problem I assumed that it was the card and got another one so I think I can rule that out. Thanks for your help.
Matt.

 

[bradman666]

A glimmer of light... I changed graphics aperture size to 32Mb from 64Mb and I now get a wrong colour image out of one of the heads. There is another setting vga shared memory size that I could change. The other thing that I changed was primary vga bios from on board to agp vga card.
Thanks, Matt.

 

[bcastner]

Shared memory is important - set it as high as it permits.

AGP aperture size is only used when necessary; when not used it is returned to the system. So it can be set to anything really you would choose although any more than 16MB is unlikely to be of any value.

Primary video adapter settings of any kind in the BIOS should not be the onboard adapter. If there is not a motherboard jumper to disable the onboard video adapter completely, and no such choice in BIOS, at least make certain that the onboard adapter is disabled (not uninstalled) in Device Manager under XP.





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