Black screen

Hello, recently I replaced the motherboard with the processor (Asrock fm2a88m extreme4+ and A10 7890k on m5a 78l-m lx3 and fx 6300) was faced with a strange problem: in DotA after some time game crashes to a black screen, the sounds for a moment lost (Games, systems, and discord) then everything appears back, but the game is not responding and have to close it via the Manager. In the same Tarcowie, even though he was more demanding, this is not a problem. On the old processor had the same problem, but so rare that I didn't pay attention.
p.s. Looked at other forums, not much help.
PSU 650W video Card rx470 4gb and 8GB of RAM.
Did anyone with a similar problem and if anybody knows the solution?