Mac screen goes black

[Ski52]

Parallels 11
IMac late 2013 OS Sierra 10.12.5
Win 10
Just recently - 1 - 2 mo ago - Mac screen goes black out of nowhere. I will be on the Mac, full screen with Win running also. Mac screen will go black - press F6 to go to Win (not in sleep mode) press F6 again back to Mac, screen OK for about an hour - hour & half, then it repeats. Mac is usually active - surfing, typing etc, screen just goes black.
See if I can resolve this, then attack who has control of the mouse, cuz it's usually not me.

Thanx
Ski

 

[PaulChristopher@Parallels]

Hi @Ski52, please start your virtual machine and go to Action, select "Reset" to check if the issue persists or not. Keep us posted the results and we are happy to help!

 

[Ski52]

I did what you ask for. Will let you know later.

Thanx
Ski

 

[Ski52]

No Go. Lasted ~35 min.
The 'Reset' is a simple cold boot.

 

[PaulChristopher@Parallels]

No Go. Lasted ~35 min.
The 'Reset' is a simple cold boot.

Hi @Ski52, please help us with the screen shot of the error message, we will check and assist you further.

 

[Ski52]

There is no error message - it's a black screen, like the Mac monitor went to sleep.