https://community.usa.canon.com/t5/Speedlite-Flashes/What-would-cause-the-flash-not-to-fire/m-p/34691#M1703 <P>Can you be more specific?</P><P>&nbsp;</P><P>When you power it on, you should get a red Pilot light when it's ready to fire. &nbsp;If you press the light (it's a button) it should test-fire the flash. &nbsp;That will confirm the flash actually works.</P><P>&nbsp;</P><P>You can tell the camera to disable the flash... this is useful when you just want to use the flash's focus-assist beam to help the camera lock focus, but do not actually want the flash to fire. &nbsp;Check your camera menu... probably under "External Speedlite Control" -&gt; "Flash Firing" and check that it is set to "Enable".</P><P>&nbsp;</P><P>&nbsp;</P> Mon, 22 Jul 2013 04:03:49 GMT TCampbell 2013-07-22T04:03:49Z https://community.usa.canon.com/t5/Speedlite-Flashes/What-would-cause-the-flash-not-to-fire/m-p/34609#M1702 <P>What would cause 580ex not to fire?</P> Sun, 21 Jul 2013 20:19:55 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/What-would-cause-the-flash-not-to-fire/m-p/34609#M1702 SharonP 2013-07-21T20:19:55Z https://community.usa.canon.com/t5/Speedlite-Flashes/What-would-cause-the-flash-not-to-fire/m-p/34691#M1703 <P>Can you be more specific?</P><P>&nbsp;</P><P>When you power it on, you should get a red Pilot light when it's ready to fire. &nbsp;If you press the light (it's a button) it should test-fire the flash. &nbsp;That will confirm the flash actually works.</P><P>&nbsp;</P><P>You can tell the camera to disable the flash... this is useful when you just want to use the flash's focus-assist beam to help the camera lock focus, but do not actually want the flash to fire. &nbsp;Check your camera menu... probably under "External Speedlite Control" -&gt; "Flash Firing" and check that it is set to "Enable".</P><P>&nbsp;</P><P>&nbsp;</P> Mon, 22 Jul 2013 04:03:49 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/What-would-cause-the-flash-not-to-fire/m-p/34691#M1703 TCampbell 2013-07-22T04:03:49Z