My speedlight won't stop blinking and isn't working. It makes a weird sound when I turn it on and it has fresh batteries.
Hi Mate I had the same problem with mine and it was the zoom mechanism was stuck, I've put together a detailed tutorial on how to fix it here: https://androostain.wordpress.com/2013/01/20/fixing-a-canon-430ex-flash-rear-buttons-not-responding/
I agree with the other two answers. make sure that the diffusion screen is pushed back firmly into the flash head
Check the diffuser is fully retracted. Pull it fully out then all the way back in.
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