problem with rx 580 and LG monitor

r.burgess.noddem

Prominent
Sep 13, 2017
3
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510
just got a rx580 to go with my LG 29Um59 monitor that says it is freesync compatible, monitor has only 2 HDMI ports.
i have a displayport to HDMI cable ,it says on radeon display,, freesync not recognised
Any help before i return it although I am sure its something small i am not doing, cant find anything on monitor to turn on, perhaps someone can help me,

Thanks
Raymond