Canon 580 ii is sometimes causing a black screen while shooting. i tried out with diffrent flash and this problem didnt appear. it happends after like 50 shots and then every few pic i get black screen even though i see the flash is firing out. someone said it might be the lamo coming to the end of its life, if anyone know's more about it please respond.

SOURCE: Battery dies right away

You might want to try NON rechargeable batteries, particularly "digitally" rated alkalines. If this won't do it, I'd take it to get looked at.

SOURCE: Flash won't shoot

does the red bulb show when the flash is ready to shoot ? you can press the button that lights red or green to test the flash on itself.

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: Canon speedlight 430EX II won't fire

The conceting piece of the Flash has cracked when i dropped it, is there any thing i can do to repair or exchange it?