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.

Took a 3' length of cat-5 cable, a pair of mini DIN connectors, and a 
Euro terminal strip, made a breakout. Found the mouse clock circuit was 
the culprit using a logic probe, which showed a logic low and no 
activity when the KVM was down. When the KVM is active, a logic high 
with activity shows.

Pulled the motherboard, visually inspected the area, nothing special 
noted, but reflowed a couple of pins in the mouse connector area. Tried 
ringing out the circuit from the socket, only got as far a few surface 
mount components, but lost at a via that either went to a in between 
layer, or under a component.

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.

Any thoughts appreciated. :)
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