My HP Z1 Workstation turns off arbitrarily. No shut down, suddenly the power is gone. No matter whether Linux or Windows, also in the BIOS menu it can happen. Sometimes it happens several times in succession, then again several days not. A temperature problem? The graphics card already exchanged: No effect. In the BIOS menu the fan speed increased: No improvement. HWMonitor does not show any conspicuous temperatures, but it does not show any temperatures concerning the motherboard.
How to find the error? A well-known phenomenon?