Apr 24, 2008
I have a lot of usb stuff strung out: 6 kbds, 5 mice (three kinds), 4 audio interfaces, 7 hubs not counting in kbds, etc.; most powered. At the root of the USB tree is a KVM switch feeding a new MacBook (10.5.2) and a G5-Quad (10.4.11) This all pretty much works fine and runs for weeks without hiccup.
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But tonight, one MacPro kbd, quit. It's at the end of the chain, but it has been working fine. Plugged into hub one level up it's fine. A new Apple thin-flat kbd plugged in where it was works fine.
When MacPro kbd plugged in, the light on the hub port flashes. Other stuff (Wacom tablet, Insignia speakers) works fine and lights the lights. With other stuff pulled (use less power?) kbd fails the same.
So what's up with this sort of problem, and how does one trace/debug? Usually, when (once in a while) there's a USB problem, just unplug and plug back in and it works again.