> then hold down the power button on APCI computers, the power button is software-controlled, i.e. it sends a signal to the OS, if the OS is currently frozen (

> then hold down the power button on APCI computers, the power button is software-controlled, i.e. it sends a signal to the OS, if the OS is currently frozen (or is configured to ignore it), pressing the power button does nothing. But to override this, if you hold it for about four seconds, a hardware shutdown still happens (is it done by the motherboard?). There are also other functions, like holding the power button for 30 seconds to enter into recovery mode on iPhones. I wonder if holding the power button on a running EV car does anything similar...