> > You need to put a load on the 12V rail, it won't start up
> otherwise.  
> > 
> > A lot of people put a 10W resistor across it so it draws a
> half amp or so.
> > A light bulb works too.  Occasionally I'll just plug in a old
> hard drive.
> 
> Sorry, I didn't make it clear that the rest of the PC is still 
> there and connected to the PSU, so there is plenty of load on 
> all the power lines.


Ah, that's a bit different.  I though you just had a PSU lying about on the
bench.

This won't help you much, but I tried this with a PSU, and got zero volts on
both the 5 & 12v rails.  The 5v standby is only on the 20 pin plug, it's the
purple wire.

I tried just plugging it in, then powered it up, and back off without a
load.  I tried it again with a load (hard drive) and got the same results.

Maybe you have 2 duds?  Mine was just you usual no-name generic.

Tony

(sometimes they'll power up without a load, but don't regulate properly
without a load.)

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