Two Video cards

[chad2323]

Hello all I have a MacPro 2009 that came with a GT120 I ended up getting a GTX285 and had the other one in the computer for awhile and then took it out now a few years later I wanted to put the 120 back in and use a third monitor I read that it can be done but when I put the 120 in the computer won't boot up it just freezes. I'm running everything current Mountain Lion any suggestions would be appreciated.

Thank's

 

[chad2323]

Still trying to figure this out but not having no luck. I tried to stick the other card in every other slot but still won't boot up. The only thing I didn't try was to reinstall the os with the 2 cards in the Mac Pro ?When I take the card out boots up fine. Any suggestions would be appreciated.

Thank's

 

[ActionableMango]

I have no idea but I can suggest basic troubleshooting steps.

Remove the 285 and try just the 120 by itself. Maybe the 120 has died in the closet.

Install OS X fresh onto a spare drive with full updates and no other software, hacks, tweaks, etc., and see if it works there. This will eliminate any software issues.

 

[chad2323]

Thank's for the suggestion. After trying for the last 2 hours to get it to work I have come to the conclusion that it's the video card. I took all the cards out and only left the 120 in and hooked up the monitor and all you get id lines across the monitor. I tried all the slots and get the same result. Not sure what happen to the card but seems it's no good. Thank's again for the help.