Harry Travis wrote:
> Surely, the juice for controllers is trivial compared to what CPU's are
> drawing today.
> 
>  But, as you build and rebuild, can you provide an URL for a proceedure
> for distinguishing bad power switch from bad power supply from bad
> motherboard?

On an ATX it is just; plug in the PS, short two pins on th MB, the PS 
turns on.  If it doesn't turn on, swap the PS or MB, throw away the 
one that doesn't work.  I was at CES last week.  Someone wanted to 
sell me a POST test card; $900.  Do you know how many decent MBs you 
can buy for $900?  And then there are the $55 BIOS upgrades.  Any MB 
that doesn't do what you need is either in warranty or can be replaced 
for $50.

> Do power supplies of the last 5 years contain internal
> fuses that may be all that is wrong?

Any "real world" PS will have active protection.  It is reset by 
pulling the power plug.  I have had a few PSs quit.  I have one where 
the machine will not always power up.  When it does, if I tap the PS 
with a screw driver it will shut down.  I may pull the cover to see if 
I can see anything loose.  More likely I'll toss it in the corner and 
that will be the end of it.  I have salvaged the fans for case fans.

Ray




 
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