The extremely irritating condition when a
motherboard's
power supply is controlled almost entirely by
software. When (not if, WHEN)
Windoze crashes, the power button will not respond (Since Windoze hasn't TOLD it it can shut down), meaning you
cannot turn off your computer without reaching for the
power cord and the <insert
alternative-OS-of-choice here> disks.
Most boxen like this usually have a kill switch (i.e. Hold down power button for five seconds) for just such occasions. However, they are usually not documented well.
Yes, I think this is noded elsewhere... but where?