USB devices disappear?

Help! I'm having a problem with my USB devices disappearing off the desktop, never to be seen again, within a few seconds of plugging them in. Not sure what's going on, but here's a video of it... http://www.youtube.com/watch?v=_OlUel2lXQA
Any ideas?

Are you getting any messages associated with the disappearances?
What kind of devices are affected. If they are exclusively bus-powered storage devices (don't have their own power brick to plug to the wall socket), they may be demand more power than the computer's USB bus can provide.
The cure for that is to buy a powered (does have a power brick for use in a wall socket) USB hub. The hub only has to worry about powering whatever devices you attach, thus taking a load of the logic board USB ports.

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