Monitor Black Screen While PC Still On

[ExpireDx]

When I turn on my PC I get random black screens while gaming which forces me to hard reset the PC. This started happening 2 days ago.

I have a Intel i7 4790k
750w egva PSU
Sapphire R9 290 Tri x GPU
G Skill 2 x 4 GB Ram
250gb Samsung SSD
2TB HDD

 

[SlayZombi]

I get the same thing sometimes. hmmm...