System with problem

Hello, I ran into the following problem:
While playing a game, and just looking at something on the Internet, a small number of horizontal stripes began to appear on the monitor, after which the monitor went into reboot (as I found out that most likely the drivers were rebooted).

The system is as follows:
-Amd ryzen 3 3200g with vega 8
-nvidia gigabyte gforse 1050ti 4gb
-One 8gb RAM plate
-SSD kingston 480gb
-old power supply
-win 10

What has already been tested and done:
1) ran stress tests of the system both together and individual components (the video card did not fall off during testing, the processor too)
2) changed the old hard drive to Ssd kingston
3) updated the video card drivers. With the drivers, this is the topic - installed the latest drivers, the problem did not disappear, but if you roll back and install them marked "clean install", then the problem went away before restarting the computer.

What to try:
reinstall Windows and change the Power supply

Who faced this and did you manage to solve the problem? Vidyuha on stress tests showed that she was alive.