"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?