🚀 go-pugleaf

In article <31836157.529328@news.demon.co.uk>, Hemal Popat
<hemal@popath.demon.co.uk> writes

>I've got a Dell 14" SVGA monitor running off a Cirrus 5422 card (slow, but
>otherwise OK). When I plug the monitor into the 240v output at the back of
>the PC the display is unsteady, however when plugged into a wall
>outlet/extension lead no problems. It's obviously nicer to run the whole
>lot from one power switch (front of PC) than have 2 plugs.
>
>What could be the cause?

Very thin PCB tracks going to the PSU outlet socket ?  Noise from the
switchmode power supply getting coupled to mains outlet ?


> Surely if there's ripple on the mains supply it
>would affect all appliances plugged in nearby/same household ring.

I would expect so.


>Or is the 240v output on the back of the PC coming via a transformer
>winding for isolation reasons?
>
>BTW my power supply is a 200W manufactured by Alfa.

If I were you I'd just plug both into the mains. Whatever is going on,
it isn't worth stressing your hardware for the very marginal
disadvantage of having to use two switches.

J/.
-- 
John Beardmore