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This sounds like a ground loop. Make sure ALL (including the computer) interconnected devices are powered from the same receptacle. Make sure there are no lamp dimmers around as these can cause hum...
Just did it today. Hooked up CTK-720 to Imac with Snow Leopard (10.2.6) using GarageBand.
Steps:
1) Go to : http://code.google.com/p/casiousbmididriver/
2) Download the CasioUSBMIDIDriver.plugin (see the two choices on the right side of screen)
3) Place the CasioUSBMIDIDriver.Plugin file into the MIDI Driver subfolder: Macintosh HD => Library => Audio => MIDI Drivers
4) Restart
5) Plug in USB cable, open GarageBand, turn on Casio
6) In GraarageBand Open New Project, Start by using Piano, Select Keyboard (command K) in the Window menu
7) You should see the keyboard being played on the screen.
PS: Thank you Francois Ferland.
When you connect a hard drive and any other USB device to a 4 port hub you have to use the external power supply all the time. You may have fried the power pins on the USB port you used to connect the 4 port hub. If you can get the hard drive to work separately on the USB port, the 4 port hub may no longer be passing power from the laptop.
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