I installed Debian 9.13 (stretch) amd64 to a (pretty old) PC tower, and it randomly powers off a few minutes after boot, every time I boot, since the first ever boot into the new system. I booted into recovery mode and using $ journalctl -xb I see that nouveau is reporting increasingly high temps (90C 'fanboost' threshold reached, 95C 'downclock' threshold reached, and so on) until eventually the 'shutdown' threshold is reached and the machine powers itself off.
Is this more likely an OS issue or a hardware issue? I didn't experience a shutdown with the previously installed Windows 7 OS for the 10 minutes that I used it before installing Debian. I'm new-ish with linux systems so am wondering if there's something obvious I can do to save me from the very time consuming trial-and-error process of trying different machines and OS image architectures/versions.
Hardware specs:
- System model: Dell Precision Workstation 490
- System type: x64-based PC
- Processor: Intel(R) Xeon(R) CPU 5140 @ 2.33GHz, 2327 Mhz, 2 Cores, 2 Logical processors