Hi there!
System:
CPU: AMD Ryzen 5900X
GPU: EVGA RTX 3070 XC3 Ultra
Motherboard: MSI MAG B550 Tomahawk
RAM: 32GB 3200MHz DDR4 RAM G.Skill Ripjaw V CL16 (2X16GB) (F4-3200C16D-32GVK)
CPU cooler: Be quiet! DARK ROCK PRO 4
PSU: Corsair RM750x (2021)
CPU paste: Thermal Grizzly Kryonaut
OS: Windows 10 Pro N 10.0.19044 build 19044 64bit
Yesterday I started up my PC, then after opening Lightroom, the whole PC turned off. I tried turning it back on. It powered on, but my displays stayed black and the CPU red light on the motherboard was constantly on. I couldn't turn it off by holding the power button, so I switched off the PSU, then switched off the power strip. After this I turned them back on, then my PC booted up. I ran a CPU stress test while also running Furmark, everything on 100% for several minutes. CPU hit around 75C max and GPU around 72C max. Then I was streaming for three hours without any problem.
Today I turned on my PC, started up OBS, started streaming with The Witcher 3 running, then two minutes in, it turned off. I tried to power it on again immediately, but for three or four pushes, only the CPU EZ Debug red light, and the RGB light on the GPU turned on for like half a second, but nothing else happened.
After this it turned on again, but after starting streaming, it turned off again.
After this I checked what the red EZ Debug lights are doing during a successful bootup: after pushing the power button, the CPU red turns on for a few seconds, then it turns off, the DRAM light blinks a few times for a split second. Then the VGA light is on for a few seconds, then the BOOT light is on for like a second, then all the LED's turn off.
I built the PC in December of 2021 and didn't have any problems like this. I have either the 7C91vA8 or the 7C91vA7 BIOS installed (I will check tomorrow), but definitely not the newest 7C91vA94(Beta version) which was released on 3/15/2022. I can't think of any changes I made on the PC. I didn't move it, didn't open it. The last firmware update was a GPU driver update maybe a week ago.
What should I do now?
Thanks in advance!