"RedOnRed" wrote in
:


"MarkD" wrote in message
...
I'm trying to fix a secondhand motherboard to my computer.
The existing psu has 12pins.
The new(secondhand) board has a 20 pin socket to accept power
from the psu. I've tried a couple of (actually 3) psu's
borrowed from other pc's and none of them work, ie the cooling
fans do not spin when connected to the power.
All of them work when back in their original computers.
Does the psu have to be fully connected before the cooling fans
will spin?

What's going on?

I've been trying to test the psu's before taking the pc apart
and connecting everything. Do I just have to bite the bullet?

Thanks in advance...

Cheers,
Mark,
M/cr

to reply by email, please take the michael

Traditionally, with PSU's, if you just connect mains power into
them without connecting the PSU's power leads to say the
motherboard etc...then the PSU will blow. It needs to dispel
it's incoming power some where.



Nonsense.