Pilot light not lighting on 420ex speedlite canon flash
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.
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