USB port power on when pc off?

On my Windows XP tablet, if I put an MP3 player into a USB port, does it charge the battery even when the pc is completely shut off?
I don't like to leave it plugged in to charge when I am using the pc since it keeps bonging (making a darn noise) every few seconds
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  1. Best answer
    There's a very easy way to tell - try it and see.
  2. OK. Not smart am I?
    I'll need to run the battery down and then try it!
  3. Possibly...

    I plugged my Cowon S9 into my HTPC which is plugged into the A/C outlet, but is currently off.

    The Cowon's screen activated and is letting me know it is charging.

    For a tablet / laptop, I don't know for sure...
  4. Best answer selected by vankjeff.
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