Hello, I bought a totally new computer with Ryzen 2600x end of last year. I am using windows 10, and in the last couple of months it started acting funny, when I cold-boot, login, open a web browser, browse for like 5-10 minutes, the computer suddenly goes black. Mouse, keyboard is not working anymore, screen is switched off, etc. I thought first it was a memory problem and run the memory test, but it found no issue at all. I decreased the memory speed, but still had the problem, the difference is that instead of going black the computer restarts. No information in windows event log is visible except the unexpected restart. The problem occurs just right after starting the computer, when I play with any modern game for hours (like Borderlands 3, etc.) there is absolutely no problem at all. Run CPU stress tests, but no problem there.
Motherboard: ASROCK B450 Steel Legend
Memory: Kingston 2x8GB DDR4 3200MHz HyperX Predator XMP HX432C16PB3K2/16
CPU: AMD 5 Ryzen 2600X YD260XBCAFBOX
Power: FSP 600W Hyper M