I feel a little lost here.
Not sure it's the right community to ask, anyway:
I have installed Debian 9 in a new office that I have assembled. When I restart, 4/5 times, it remains stuck on a black screen, past in front. Other times, it starts perfectly.
As it hangs, I have to perform a hard reset until it works, so that I can not read the bad logs to dmesg.
I thought it was perhaps a graphics driver problem, so I installed AMD proprietary drivers without success.
ASROCK 990fx extreme4 AMD FX 8350 AMD GeForce GTX 260 SSD 240gb