ATX power supplies are different from the AT in that it doesn't use a direct
switch to the PS as in an AT.  You have to plug the motherboard connector
from the ATX PS to the MB, then plug in the connector on the case that comes
from the Power on button on to the motherboard. You'll have to check the MB
manual to see where to place this connector.

Check to make sure that the Power On button  is plugged in to the board.
Chances are that either the PS is dead, the connecter from the power on
button to the MB are bad, or the MB itself is bad.

--Patrick Black
CCNA tm Certified



-----Original Message-----
From: PCBUILD - Personal Computer Hardware discussion List
[mailto:[log in to unmask]]On Behalf Of Nick Torraca
Sent: Saturday, July 01, 2000 2:17 PM
To: [log in to unmask]
Subject: [PCBUILD] ATX power supply


Hello everybody,
I just encountered my first atx power supply and I have a question about how
its supposed to operate. Its in a friend's computer that has become totally
dead. I removed it completely from the system and plugged in the power cord
and its still dead, no outputs and no fan. My assumption is that the power
supply is bad. The internal fuse is good, by the way. My question is: Does
the atx power supply need some sort of enabling signal from the computer to
turn itself on or is it that the signal from the computer turns it off? In
other words, is it a valid test to remove the PS from the system and see if
it works all by itself not connected to anything? Anybody have a good online
source for getting a new power supply? Thanks a lot. -Nick

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