Dell p2815q no longer working with Macbook Pro A1398

Hi,
Some time ago I bought a dell p2815q monitor. It would work just fine using the display port to thunderbolt connector.
After some time my Mac Pro simply stopped picking it up. When I connect it, it seems like it tries to display on it but it blinks every couple of seconds and no input is detected on the monitor.
I've checked that the connector is fine, it simply works with other monitors and have also tried doing a PRAM reset.
I also checked the display itself and it works like a charm with other non Mac laptops.
This is becoming very annoying and need to find a solution to the problem. I am running Yosemite 10.10.1.

Hi, I got the same monitor the other day and there should be no problem getting it to work.
Use the DP to mini-DP cable supplied with the monitor.
Make sure this cable is plugged into the correct input DP port in the back of the monitor (not the DP port for daisychaining).
Make sure the DP input is selected in the inputs menu on screen.
Plug mini-DP end of the cable into Mac
Should work ...

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