I have a Canon Speedlite 420EX.
In the front LOWER part there was a piece of plastic protecting two small lenses.
I have lost that plastic protection.
Can I buy it separatly and replace it myself?
If yes Where? What would be teh part number?
Otherwise what must I do?
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This may seem dumb to ask but have you made sure all batteries are fresh (even new ones can be bad), they\'re inserted correctly observing polarity and the contacts are clean in the flash? (You can clean them using a clean, dry pencil eraser and a Q-Tip dipped lightly in alcohol.)
Also, try mounting the flash on your camera, turn both on and reset your camera to factory default settings through your camera menu settings.
The buzz noise may be the zoom motor in the flash activating as it starts up. If it encounters resistance it will shut down to protect the motor and flash. It's impossible to tell if something has jammed the zoom motor or path without opening the flash (I suggest you don't). If mounting the flash on your camera, turning both on and resetting your camera to factory default settings through your camera menu settings doesn't reset it you'll probably need to send it in for repair.