P2214H - Display port issue

We cannot speak to the untested mac. Assuming the AMD Radeon R9-280 is in a computer running Windows? This is confusing, "(Multiple output (DP/HDMI/DVI-D)". List the specific out ports on the video card itself. It sounds like you are saying that the video card has mDP out, not DP out?

* Computer AMD Radeon R9-280 mDP out --> mDP to DP cable --> P2214H DP in
* Press the P2214H Menu button
* Go to Input Source
* Check DisplayPort
* Go to Energy Settings
* Set Energy Smart to Off
* Exit the OSD

Some users mentioned having success using this cable rather than ours.

Thanks for the reply.

Apologies for the confusion as I tested the monitor on both a PC and a Mac.

Basically for the PC - yes its running windows.

The graphic card itself has got 4 outputs: 2x mDP 1x HDMI 1x DVI

I've tried the above as you stated - but the monitor still goes into power save mode (with the display port icon)  - have tested with both mDP outputs.

As for the Mac, i'm using an adaptor similar to this:

http://ecx.images-amazon.com/images/I/31UMw6eppKL._SY300_.jpg

Since i've been using this with my Mac via HDMI to my TV - no issues, decided to try it with my Mac using the display port output instead - but same outcome as above.

Shifted the adaptor to the PC - same outcome as well.

Appreciate your advise, have already RMA'ed the monitor once.