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June 27, 2013, 04:55:45 PM |
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This occasionally happens in Linux (at least it has with me) and although there are likely much more direct/better ways to fix the problem, I have run into it 3 times while moving stuff around between computers -- and the "quick and dirty solution" that has worked each time was to simply reinstall the AMD/ATI Catalyst drivers again. Also (again, with Linux) there's a command: export DISPLAY=:0 && sudo aticonfig -f --initial --adapter=all That needs to be run whenever you change the number of cards, or the order of the cards (if they're not all identical), that reconfigures X so it knows "which card is which, and where it is, and in what order to load them," and stuff like that.
I realize you said you're running Windows, but I think at least the first part (reinstall -- or uninstall then install fresh, if necessary) is worth a try. Like I said above, it isn't the most glamourous solution, and there has to be a configuration file *somewhere* that you could just edit if you wanted to do it "properly" -- but reinstalling the drivers will take you less than 5 min, so that's the troubleshooting step I would go with first, regardless of whether I was running Windows or Linux.
Besides, if you go start that process now ... by the time you're done, you will either have fixed your problem, or someone far more knowledgeable will have posted below me to explain why everything I just said was absurd "and what you really should do is XYZ." So you'll have an answer (or two) to your problem in no time. :)
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