The display on my speedlight is flashing in ETTL and M modes when it is on my camera; does anyone know what this means as I cannot find out in the instructions?
In reply to Richard Smith: have you tried the angle of the flash head? I think from memory that the display will flash, and it wont fire if the angle isn't clicked in correctly
In reply to Richard Smith: also , try going into the speedlite menu on the camera and clearing all the settings . my 580 went a bit odd and clearing everything sorted it