Unless the power supply is unplugged, the system reboots after "shutdown -h now". I just came to find out the system was powered on after a shutdown command last night. I tried the same command again. The problem is reproducible.
Edited. Following comment added: Well, on extra try to reproduce, the problem did not occur. Guess this is intermittent.
Edited. Following comment added: Well, on extra try to reproduce, the problem did not occur. Guess this is intermittent.