Question About new Asus M3A78

Hey guys I’m new to the form and you all seam very knowledgeable and just have a quick question. Recently built another computer setup as follows: Asus M3A78 bios version 703, Athlon XP x2 5000 brisbane, 2GB Adata DDR2 Ram 5-5-5-15, xFx geForce 6500 256mb PCIe, WD 500GB HDD, 2x Pioneer DVD RW, Win XP Media Center 05 SP3, 550 Antec Modular PSU. Now my question is when I power down my computer, The USB ports will still have power and anything connected to them will remain on, is there any way to get them to shut down with the computer? I can’t seam to find jumper on the mobo for it and I don’t see an option in bios for it. Any help would be appreciated.

Do you have a self powered usb hub attached?
I have 2 M3A78's and the usb's shut down at power off.