JIM HOLSONBACK wrote in a message to ROY J. TELLASON:

-=> ROY J. TELLASON wrote to JIM HOLSONBACK <=-

 RJT> JIM HOLSONBACK wrote in a message to PAUL ROGERS:

 JH> With standard ATX PS pinouts,  one simple check which can be made -
 JH> with mains power attached, and PS power switch (if any) turned on,
 JH> shorting between ATX power connector pin 14 (green wire, per std)
 JH> and either of the adjacent black ground wires will cause the PS to
 JH> wake up, and the fan to start spinning. The whole thing will 'shut
 JH> down' again when that short between those pins is released.  I
 JH> doubt at that stage that there is a way to do much of any
 JH> meaningful voltage readings on the other pins, since there is no
 JH> load attached to the PS, and its voltages will not likely be
 JH> stabilized to near what they might be if PS were connected to a MB.

 RJT> So if I were to take a bit of wire,  and jumper between that green wire
 RJT> and one of the adjacent black ground wires,  and get absolutely *no*
 RJT> response when I flip the power switch on (power cord is in and
 RJT> connected),  is it then safe to assume that I have a problem with the
 RJT> power supply there?      :-|

 JH> Maybe.  If that PS did croak on you,  the timing of its demise
 JH> seems like a big coincidence, since I know you've been working
 JH> around inside that case, trying to get the system to come to life.

 JH> For that little test we're talking about,  maybe best also unplug
 JH> all drives, or any fans which may be attached to the PS, just in
 JH> case one of those may have somehow shorted itself out.

 JH> Sometimes, when a bad board or other component makes a PS refuse to
 JH> power up,  the PS can take several minutes to reset itself and
 JH> start working again.  I don't know anything about the circuitry
 JH> which may be associated with that.

Already replied to this in email,  but...

The PS is sitting here connected to *nothing*,  power cord in there, 
jumper wire in the output plug,  and when I flip the switch I get
absolutely *NO* response from the fan,  not even a twitch.

It's sitting here on top of my copy of "Upgrading & Repairing
PCs" which is open to page 1097 which in this edition shows me the ATX
PS pinouts,  which is sitting on top of the sideways-laying case on my
desk.  Time to clear it off of there and move on to some other things, 
like upgrading the software I got when the hardware arrived the other
day...

*sigh*

Always something,  ain't it?

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