Pin 18 is the -5V line, and most recent boards don't use it.
Unlikely it would affect any board from turning on as it's
not part of the power good signal anyway.
"BrianBloodaxe" wrote in message
...
"BrianBloodaxe" wrote in message
...
"Mike Walsh" wrote in message
...
Probably not. There is a wire that goes to the power supply that
must be
grounded to keep the power supply running. I don't believe that will
be
active without a CPU. With a CPU installed the power should stay on
an you
should get a beep code for no memory.
BrianBloodaxe wrote:
My question is If you have got say just a motherboard and an atx
power
supply and nothing else, no hard drive, memory cpu etc. When you
connect
the
power supply to the atx power socket on the motherboard should
the
power
supply come to life with the fan spinning if the power connector
jumper
is
connected to a switch on the front of a pc case?
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Mike Walsh
West Palm Beach, Florida, U.S.A.
I shorted sockets 14 and 15 on the power supply unit and it comes to
life.
So that seems to be okay.
"Make Walsh" wrote 'I don't believe that will be active without a
CPU.
With
a CPU installed the power should stay on an you should get a beep
code for
no memory.
'
Is this true. Does the processor have to be attached to the
motherboard
for
the power supply to be switched on. I thought that it didn't. I
thought
you
could connect a good empty motherboard to an atx power supply, then
short
the power switch connectors on the board, and the fan would start up
on
the
power supply.
Anyway I attached a processor and tried it again but nothing
happened.
Does it look as if this new motherboard is faulty? I got it off ebay
so I
suppose I have to write it off to experience.
I've just read that this problem may be caused by a fault with the
power
supply connector that attaches to the motherboard. I've noticed that
there
is no Pin 18 http://www.jeae.dk/Computere/atx_-_psu.htm It is empty on
my
power supply. Might this be the cause?