On 5 Sep 2006 at 16:18, Carl Houseman wrote:
> I know the problem with saying "never" but sometimes I'll throw it out there
> just to invite someone to produce real world results to the contrary. (they
> would probably not bother to post otherwise unless given the chance to prove
> me wrong ;) )
>
> Since you have said "it does happen" and "it 'can' happen", is that personal
> experience? Which motherboard? Or is there a web URL reference to someone
Yes personal experience, last time about 3 years ago, I think it was one of
those knock-off brands like PC-Chips or some such, also experienced it
various times over the years in my own business and when working part time at
a computer repair shop, that was the last time I saw it.
Also I do remember this being mentioned in one of the Upgrading and Repairing
PC's tomes by Scott Mueller, IIRC it was around version 5 or 6.
>From version 8.0 of Upgrading and Repairing PC's, page 304
"According to IBM specifications for the standard 192-watt power supply
using
in the original IBM AT, a minimum load of 7.0 amps was required at +5v and
a
minimum load of 2.5 amps was required at +12v for the supply to work
properly. Because floppy drives present no +12v load unless they are
spinning, systems without a hard disk drive often do not operate properly.
Most power supplies have a minimum load requirement for both the +5v and
+12v
sides, and if you fail to meet this minimum load, the supply shuts down."
He goes on to say on page 304 and 305, that some PSU's have an internal load
resistor and will startup without ANY load attached, but that most modern
PSU's require less load than above, but nonetheless require a load for
startup due to the nature of switching vs. linear power supply design.
Note, this particular editon was published in 1998....
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