Phil Mendelsohn <mend0070 at umn.edu> writes: > Look, it's just a switching mode power supply. There's no magic about > attaching a motherboard. The reason Ben's trick below works is because > sometimes they cross couple the current limiting / protection circuitry. > Some chips that require both +5 and +/-12 will die if one rail dies, so the > conservative P.S. designer will kill the whole supply rather than let one > rail stay up and kill chips. I thought there was a "power good" signal fed back from the motherboard, which the power supply looked for very shortly after startup, and shut down if it wasn't present? Mine certainly behave that way! -- David Dyer-Bennet / Welcome to the future! / dd-b at dd-b.net SF: http://www.dd-b.net/dd-b/ Minicon: http://www.mnstf.org/minicon/ Photos: http://dd-b.lighthunters.net/