Mac Mini (OSX6) freezes on boot if USB cable to KVM connected
I have a Mac Mini (OS X 10.6.8) that has started freezing with a solid grey screen on boot up (i.e., no Apple logo, no spinning wheel). The work around is relatively easy: all I need to do is disconnect the USB cable running to my ATEN KVM CS1768 switch, power down, power up and then reconnect the USB cable once the Mac desktop is loaded. While this just happened three times in a row, it doesn't happen all the time. The first time it happened last summer I spent an hour on the phone with Mac support (the computer was still under warranty at that point) and the very last suggestion they made was to disconnect the USB cables before attempting to reboot. (I don't recall precisely if the problem occured when my USB peripherals-- a Mac USB keyboard and mouse-- were directly connected to the Mini rather than being routed through the KVM switch, but I *think* it did.)
If anyone has a quick answer or can point me to a prior discussion of this same (or a related) issue, I would be most grateful
Mac mini, Mac OS X (10.6.8), Client Version