That's a firmware issue if the board does not power back on after physically cycling power (regardless of the previous power state of the board) while that option is set to "Power On". Have you tested it a few times? Maybe a low-level feature like that requires at least one full power cycle before it takes effect? The behavior you described is what happens when that BIOS option is set to "Last State".Either I'm misunderstanding, or it just doesn't work as needed on my motherboard (SuperMicro X10SL7-F). I changed the BIOS setting "Restore on AC Power Loss" to be "Power On":