M-Audio USB keyboard won't work

Hey,
I have an M-Audio keyboard controller connected to a new iMac and when I fire up Garageband it sees the MIDI device and when I play the keyboard, it works for 2-4 notes and then silence. Nothing I do brings it back.
If I fire up the OS X utility Audio MIDI Setup and do a MIDI scan, the keyboard again will work for a few notes then silence.
I've used this keyboard on another Mac a year ago with Garageband and it worked perfectly.
Any ideas? Thanks!

Turning off the wireless keyboard allowed Garageband to see the MIDI device. Weird.
One problem with wireless keyboards or mice is, that turning on the keyboard while the mac is booting can accidentally cause the mac to boot into safe mode. (Mac OS X: What is Safe Boot, Safe Mode?) In that mode all third-party extensions will be disabled, also your Midi devices.
To prevent this, turn on all wireless devices before you start-up your mac.
If that was the problem, restarting your Mac should help, to get out of safe Mode.

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M-Audio USB keyboard won't work

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