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It should be nothing more than
- Turn off computer.
- Plugin in DP cable to monitor and GPU
- Set input source on monitor to Display Port (not miniDP). Also, this should really not be needed because it is usually automatic on monitor.
- Startup computer.
There is nothing to change on the GPU or in radeon settings. If it's not working, I suggest trying a different DP cable because sometimes they are defective.
An active display port adapter should solve your problems.
You shouldn't need any adapter if you are using a DP cable on both ends. I agree that given all that you tried it has to be the cable. Get a new one. I have had 5, 3 worked great, 2 not at all. If that doesn't work, use one of the other ports on your monitor e.g. HDMI. run the HDMI cable all the way to the computer. If video card doesn't have an HDM port, then purchase a dongle that attaches to the computers DP port and has an "active" HDMI on the other end. Easy to get from Amazon, Newegg, etc.