USB devices won't wake up

after I wake up the Mac itself, USB devices often don't wake up.

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Alan wrote on 20 February 2006:

On a 10.3.9 iMac: after I wake up the Mac itself, USB devices often don't wake up. This is true for a zip drive plugged directly into a USB port and for a scanner connected via a USB hub. I often have to unplug/replug to get the zip cartridge to mount or the scanner to be recognized.

Why does this happen and what can I do about it?

Thanks,

Alan