More info needed: Will the flash fire when you push the test button? Have you rest the camera you're using to factory defaults while the flash is mounted on the camera and turned on?
SOURCE: I bought a brand new 580 ex 11 flash unit. When I
The grinding noise is the zoom head trying to match the focal length of your lens. A brand new one should NOT grind. It should be silent. It sounds like you got the one that fell off the pallet during shipping. Exchange it for another one.
Testimonial: "lightspirit, Thanks very much for your response. It has be sent back for an exchange! Regards, Dantana"
SOURCE: Why wont the pilot light flash on at all ?
Because of the high voltage inside the camera, that will have to be sent to Canon for repair.
SOURCE: speedlite 430ex, pilot light on,
Typically, it means your batteries are low but I am sure that you know that already.
The next cause is a mechanical failure. The flash has capacitors that **** up the battery power until they have a full charge and the trigger the ready light. Therefore, if your batteries are good then it is likely that the capacitors are disconnected or have failed. Eitherway, you will most likely have to send it out to a Canon service center. You can find service centers at www.canonusa.com.
I hope this helps. Good luck!
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