On Fri, 2007-02-16 at 09:29 -0800, John Wendel wrote: > Logitech optical mouse, it's not a laser, just a red led, connected to > the PS/2 mouse port through an adapter. NO KVM involved. What's the adaptor? For what it's worth, I've had all sorts of troubles with PS/2 mice over the years doing wild behaviour (scooting about and clicking everywhere), but USB mice haven't done that. The worst they've done is a momentary scoot off in one direction, occasionally. I had one that was shockingly bad through a PS/2 extension cable, but mostly fine when plugged in directly. It made me wonder whether the power to the mouse was poor, so the chip inside it was acting randomly.