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I bought a Yongnuo YN560II external flash for my Nikon D3100 right before Christmas. When I first started using it, the shutter speed automatically adjusted as though there were no flash, but the flash fired when I took a picture. Now when I try to use it the flash won't fire at all. I have tried it in Manual mode, Auto, and Shutter Priority without luck. I've adjusted everything I can think of. Is there something I'm missing?

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    On the flash unit, press the 'Mode' button until the mode (in the top line of the screen) says 'M', which I think is the standard mode for the flash. If the flash is connected properly and powered on, then the camera will send the instruction to trigger it. Note that the camera won't know about the presence of the flash, so it won't be able to adjust its settings accordingly. Also, are you able to try the flash on another camera eg a friend's camera? – laurencemadill May 15 '14 at 11:13
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Make sure that the flash is not in a Slave mode (S1 or S2). If S1 or S2 are engaged, then the YN-560II stops "listening" to the pin on the foot, and only "listens" to the front red sensor panel. This is the most likely cause.

You can also check the batteries, that the pin on the foot and the contact on the hotshoe are clean and making contact (i.e., that the flash is seated properly), and also try testing the flash while off the camera with the test button to see if it's something internal in the flash vs. the flash-to-camera communication on the hotshoe.

Also, the settings on the camera are completely separate from the settings on the flash. The YN-560 is a manual-only flash. To test flash settings, you have to make them on the flash itself.

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Some flash has its own maximum sync speed. It will only fire if the camera's shutter speed is within its accepted sync speed. Specially for the manual flashes. This might be the cause.

Try to change your shutter speed. make it lower. 1/180 I guest or even lower.

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The Yongnuo YN560 II (as well as I and III) are all fully manual flashes. They do not have compatibility with automatic flash modes such as TTL or other manufacturer-specific auto flash modes.

Put your camera into Manual mode, and turn the flash on. Start with a test fire of the flash by hitting the big LED light on the flash after it (usually) turns green. Did you get a test flash? If so then your flash is working, if not then check your batteries or return the unit because it is defective. Moving on, as long as the flash is ready and in the standard manual mode, it will be triggered each time the shutter is released on your camera in Manual mode. If that is not the case it is likely a defective unit.

You can also test the flash on any camera with a hotshoe mount, including film SLRs for example. Anything that will send a signal via the hotshoe should trigger the flash as it is manual.

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I've had this problem with mine.

To solve it, keep pushing the wifi button until you get the mode M without wifi.

Source of the issue: It won't fire on camera while the wifi transmitter is on.

The wifi button is the 3rd from the left. Good luck!

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