Flash wants to WAY over-expose and freezes the control panel sometimes too. Just crazy hard to control on a good day, I have tried changing off shoe cord and also putting the flash right on the camera (5D mark 2). Very unhappy, it's not that old and has always been a pain.
If resetting the camera to factory default settings WHILE the flash is mounted on the hot shoe and turned on doesn't help, you may have physical damage/failure with the flash and it will need to go in for repair. This sounds likely if you've had an ongoing problem since you got the flash.
You could also try checking the ETTL sensor to make sure it's not damaged or blocked by lint, check the flash on another camera to see if the problem persists, and check the hot shot mount on the camera and the flash to make sure they're not damaged and solid.
SOURCE: canon 430 flash
the best will be to take the flash to a canon repair center
you can try to repair it yourself, you will need a peace like this:
http://cgi.ebay.com/CANON-420EX-430EX-580EX-HOT-SHOE-FOOT-LOWEST-INTL-SHIP_W0QQitemZ370071354531QQcmdZViewItem?_trksid=p3286.m20.l1116
SOURCE: af assist on canon flash 580exii not working
check Custom Functions of Camera and Flash it can be turned off in both locations
SOURCE: Recently my canon speedlight 580 EX II TTL has
that the camera/flash set-up I use ... there are many variables - iso/metering setting/shutter settings/flash settings .
If it's a flash function problem, try this to isolate it - first, with the diffuser/reflectors tucked into the flash head, and the head straight up, with the flash set in master mode, turn it on and look on the back screen. push the mode button til you see the ETTL in the upper left of the screen .. then press the set button in the center of the dial and the nuber in the center of the display should flash (+0) while the light is flashing, rotate the dial to change the setting (i usually under power by 1/3 stop. Play with the exposures a few times to get the feel for what the EV shifts do to your exposure. generally speaking, for interior low-light, i prefer to bounce off the ceiling (if low ceilinged), if there's too much direct it will give you an uneven and predominantly underexposed image.
if you prees the mode button you will come to the same options for adjusting the output in manual mode, but it will not work with the autoexposure in the camera.
Try playing with the ETTL settings
I think the problem may be that you have somehow altered the power output setting on the 580.
SOURCE: 420 ex does not sync with the shutter, pre flash only
I have the same issue with a speedlite 380EX and a EOS50D. what did you finally do ?
SOURCE: I have the 580 ex2 mounted to a eos 5d mark 2.
Check and make sure your shutter speed is not above 200th of a sec, you may be seeing the shutter if you exceed the x-sync speed of the camera. Best to shoot at 160 anyway unless you are trying to balance background with foreground using shutter speed in which case you're going to be below 50th in most cases.
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