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apple 27' led doesnt work with radeon r9 390 graphic card

Question asked by phammkien on Dec 9, 2015

I just change my graphic card NVidia to amd radeon r9 390 8gb yesterday and it doesn't reconigze my apple monitor it just show a pnp monitor with 1289x720 resolution

it was work fine with my old graphic card with high resolution

please help me how to fix it , I don't want to buy another monitor cause the graphic cost me lot already

ps: I update the graphic card already so don't tell me that

the graphic card work fine with another monitor but only show pnp montitor on apple led 27'