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'