topic 2 out of 4 flashes stopped working in Speedlite Flashes https://community.usa.canon.com/t5/Speedlite-Flashes/2-out-of-4-flashes-stopped-working/m-p/350721#M1033 <P>I have three 600 EX flashes, and one 600 EX II flash. After not using them for 2-3 months I pulled them out for a gig and two of them seem dead, and the other two are working but one is intermittent. I cleaned the contacts and tried new batteries. It seems so strange. Any suggestions for why they would randomly die like that? Can I revive them? Thanks.&nbsp;</P> Sun, 05 Sep 2021 22:24:43 GMT sandralovesyou 2021-09-05T22:24:43Z 2 out of 4 flashes stopped working https://community.usa.canon.com/t5/Speedlite-Flashes/2-out-of-4-flashes-stopped-working/m-p/350721#M1033 <P>I have three 600 EX flashes, and one 600 EX II flash. After not using them for 2-3 months I pulled them out for a gig and two of them seem dead, and the other two are working but one is intermittent. I cleaned the contacts and tried new batteries. It seems so strange. Any suggestions for why they would randomly die like that? Can I revive them? Thanks.&nbsp;</P> Sun, 05 Sep 2021 22:24:43 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/2-out-of-4-flashes-stopped-working/m-p/350721#M1033 sandralovesyou 2021-09-05T22:24:43Z Re: 2 out of 4 flashes stopped working https://community.usa.canon.com/t5/Speedlite-Flashes/2-out-of-4-flashes-stopped-working/m-p/350815#M1034 <P>What do you mean by "dead"?</P><P>No response at all?</P><P>Unit turns on but does not flash?</P><P>Do they work on-camera?</P> Tue, 07 Sep 2021 12:57:24 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/2-out-of-4-flashes-stopped-working/m-p/350815#M1034 kvbarkley 2021-09-07T12:57:24Z Re: 2 out of 4 flashes stopped working https://community.usa.canon.com/t5/Speedlite-Flashes/2-out-of-4-flashes-stopped-working/m-p/350924#M1035 <P>Were the batteries left in during the time of non-use? &nbsp;Did the batteries leak or cause any kind of corrosion or other damage?</P><P>&nbsp;</P><P>Also agree to the question about what "dead" means. &nbsp;Note that when batteries are moved (or holds no charge) for a period of time, any settings in the flash will get reset (e.g. your unique ID value).</P><P>&nbsp;</P><P>If they do turn on, what happens when you press the test flash button? Does at least that work?</P> Wed, 08 Sep 2021 18:06:00 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/2-out-of-4-flashes-stopped-working/m-p/350924#M1035 rs-eos 2021-09-08T18:06:00Z