Computer on but signal lost on monitor while playing FPS games

[Turjake]

So my brother built a pc for first time and it worked fine for week or so but now his monitor loses signal while playing CSGO or Overwatch. We´ve been googling for answers and tried a few solutions from this site but updating Nvidia drivers or removing and then replugging graphics card dont seem to work.

1 thing we did find out was that during CSGO and Overwatch task manager showed that processor usage was very high (60%-100%).

We are complete beginners when it comes to computers so help is appreciated

 

[Turjake]

Could it be that the power supply is not good enough? He has i5 6600 as CPU and GTX 960 3.3MHz as GPU but only some Corsair CX 600M as power supply.

 

[ffg7]

if have or can borrow another monitor for testing purposes to see if still have that problem.

 

[Dragster1254]

Afew things could have happened, 1. Your monitor likes to reject the signal like my TV did not have any signal of my pc at all but monitor worked. 2. The resolution of the game is higher than the capable resolution / refresh rate of the monitor
Try changing the resolution of the game