Thanks for the reply :)

I can try that, probably tomorrow, I have the old supply that I replaced 
due to a noisy fan. But 2 items indicate against the theory of bad 5 
volt and in the interest of keeping  the message brief, I didn't 
mention: I have had a DMM on the ground to 5 volt pins, with voltage 
steady in the 4.97 volt to 5.00 volt range. When up and running in 
Windows which is most of the time 12 hours a day, the Intel active 
monitor is running which does monitor voltages and cooling temps. The 
alarm beeper is loud. There have been one second duration excursions for 
either the 3.3 or 5 volt supplies less than once a month. The computer 
has been very stable for several years.

SM Ling wrote:
>> Just an update from several weeks ago. To refresh, an Intel D845-wn P4
>> motherboard. When cold start only this computer, the KVM (IOGEAR
>> GCS612A) didn't switch on, but if 2nd computer powered up for 10
>> seconds, and powered down, everything OK. After for restarts and brief
>> power downs, all OK.
>>
>>     
> <snipped>
>
>   
>> At this point, I'm thinking it something that is beyond my capability to
>> troubleshoot or repair, likely a new motherboard is going to be on the
>> buy list.
>>     
>
>
> Try swapping in a new Power Supply and test.  Before my P4 power supply
> died, its 5V sourcing dropped quite a bit.
>
> Ling SM
>   
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