"Daniel L. Belton" writes:

tempus fugit wrote:

Hey all;
A friend handed me her dead computer to see if I could get it up and
running. When you turn it on, nothing happens. No lights, no fans, nothing.
So, I figure it's either the power supply or the motherboard (at least).
I want to test the PS first, before just replacing it. It is an ATX
300w
supply. I connected an 8 ohm 10W resistor from red (+5v) to black (ground)
and turned it on, but nothing happened. I then turned it on and shorted the
green wire to ground, but still nothing. Can I assume the PS is dead, or is
there something else I should be doing?
Thanks

You can not just short the +5 to ground through a resistor on an ATX
supply. There is a line on the ATX connector to the motherboard that
must receive a signal before the PS will supply full power. what you
can do is disconnect the PS from the motherboard and jumper the green
wire to a ground (black) wire. The PS should now come on and you
should be able to read voltages across the outputs.

Isn't that exactly what he said he did?

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