Think my flash is broke

Got a jessops 360afd couple weeks back and it was fine the day I got it. Put it back in box with batteries still in took it out to use today replaced batteries with new ones as presumed they would have drained , now flash won't do anything not even turn on . Anyone experience this before

Make sure that the new batteries are actually new and good. Check to see if you accidentally installed one or more batteries in the wrong direction.
I would suggest that you not get in the habit of storing your flash with batteries installed. Especially if you use alkalines. It is a bad habit that eventually leads to leaky batteries and corroded terminals.

dedsen wrote in post #14848138
Make sure that the new batteries are actually new and good. Check to see if you accidentally installed one or more batteries in the wrong direction.
I would suggest that you not get in the habit of storing your flash with batteries installed. Especially if you use alkalines. It is a bad habit that eventually leads to leaky batteries and corroded terminals.

Brand new in opened . Just waiting on a rechargeable set to finish so I can try those .

Working now maybe capacitors needed to decharge or something ,

Happy to hear you got it working. There should not be any kind of discharge period. Just install good batteries in the correct configuration and it should work.