Hello, guys. 
I built a PC for the first time, and I have no idea what causes my problem. The PC boots normally in the BIOS (there is no OS on it yet). After a while, the screen goes black (“No signal – The screen has gone into power saving mode.”). The CPU and case fans continue to run normally. Everything seems normal except for the screen turning off/black screen. The black screen happens completely randomly after a while. Sometimes after what feels like 15 minutes, sometimes after what feels like 30 minutes. At first, I thought it was a temperature problem, but according to the BIOS, the CPU temperature is 50 degrees when idle. The MB temperature is between 40 and 50 degrees. The CPU and RAM were detected. There shouldn't be any problems there either. I tried to install the OS once, but there was also a black screen after a while. To be honest, I don't want to try it again until the cause of the black screen has been clarified, otherwise I'll destroy something. I have now removed the GPU that was taken over from the old PC and put it back in my old PC. Everything runs fine there.
I built a PC for the first time, and I have no idea what causes my problem. The PC boots normally in the BIOS (there is no OS on it yet). After a while, the screen goes black (“No signal – The screen has gone into power saving mode.”). The CPU and case fans continue to run normally. Everything seems normal except for the screen turning off/black screen. The black screen happens completely randomly after a while. Sometimes after what feels like 15 minutes, sometimes after what feels like 30 minutes. At first, I thought it was a temperature problem, but according to the BIOS, the CPU temperature is 50 degrees when idle. The MB temperature is between 40 and 50 degrees. The CPU and RAM were detected. There shouldn't be any problems there either. I tried to install the OS once, but there was also a black screen after a while. To be honest, I don't want to try it again until the cause of the black screen has been clarified, otherwise I'll destroy something. I have now removed the GPU that was taken over from the old PC and put it back in my old PC. Everything runs fine there.
Today I rebuilt the GPU into the new PC again, making sure everything was snug and secure. Spent a good 20 minutes in the BIOS to test whether the screen went black again. Everything worked. I was really relieved, so I started installing Linux. A quick look at the HW monitor: CPU: nice 42 degrees, mainboard: 38 degrees. Everything's perfect. This time it took a full half to three quarters of an hour until the PC had a black screen again. Checked the temperature -> the interior was very warm, but nothing that would even indicate overheating. Did a hard reset and tried to start the PC several times. Nothing. Couldn't boot anymore. Fan, GPU, all LEDs lit but no display. Okay, removed the GPU again and started the PC with the integrated graphics unit. Lo and behold, it booted back into the BIOS without any problems. Built the GPU back into the old PC (which I'm writing on here) and everything works as it should. I'm really clueless. Do you have any idea what the problem could be?
Here's my part list: https://pcpartpicker.com/list/4mvgXR
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