Does not start with 4K monitor

Mid 2012 Mac Pro Tower.

Spare parts R9 280 X graphics card flashed with the firmware correct EFI (fully used and recognized by the Mac).

Today I received my new 4K monitor. When I boot the Mac the gray screen appears just after the chime. However no apple logo appears and the parts of the second half of the chimes constantly in a loop until what I pulls the strings of power out or hold down the power button. If I boot Mac without the connected monitor and finally connect as soon as I know it is completely revived, I get a screen and the full 4K resolution is put at my disposal. The computer wakes and sleeps very well.

What is the problem with my computer?

PS Connected via Display Port. DVI and HDMI does not support 4K@60hz on this map.

What specific form?

It starts OK when connected to another monitor via DP?

Have you tried:

-Try to reset memory NVRAM/PRAM and SMC

MacIntel: Reset of the controller (SMC) system management

Subject of memory NVRAM and PRAM

Tags: Mac

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