windows 10 – What could be the cause of PC crashing then failing to reboot for a while?

When running certain games my pc will reliably crash to complete black after few minutes. After that, it will attempt to boot a couple of times but go to black again during boot before completing.

All the temperatures I could monitor are fine. I think all the drivers are up to date and the problem persisted over reinstalling windows.
Also this machine ran perfectly before.

Now I dont have replacement parts to try and figure out which component might be faulty.

By these symptoms can someone guess whats the problem? Or have advice to narrow it down?