All USB ports are no longer 2.0

I have been struggling recently with the USB ports on my Intel Mac Mini, circa 2007, OSX 10.5.8. Everything I plug into any of the 4 USB ports in the back will come up as a 12 Mbps port, not a high speed 2.0 port. I don't know how to diagnose the issue here. Seems like they use to work but at some mysterious point I noticed issues.
HW View shows 4 USB Buses, corresponding to all 4 ports. Anything I plug in shows up as 12Mbps. There is a mysterious 5th USB bus labelled 'USB High Speed Bus', but nothing seems to attach to it... I figured all the ports were high speed???
Confused... any idea what to do to get these ports back into '2.0' mode?
Derek

Frequently multiple ports share the same bus.
If you plug in one slow device into any port, all the other ports that share that same bus will be that slow. The only way around it, is to use a high speed hub with known high speed devices hooked up to the hub and that hub connected to your Mac. Then you can discover which of the ports is definitely on the high speed bus. Once you've done that, only connect low speed devices to known low speed ports.

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