> Note, for me, not even a reboot fixes the problem sometimes.  I have to
> power-cycle the machine once to _twice_ to get it to come back.

Try leaving the machine off for a good 10 seconds after the power supply
fan comes to a complete stop.

Hardware can get "soft-wedged" such that a flip-off-flip-on power-cycle
does not reset everything that needs to be reset.

Todd Whitesel
toddpw @ best.com