I have done everything to trouble shoot my non-working keyboard. I've been using it a year and it is set up correctly There is supposed to be a power button? I sure can't find it!
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Many people have experienced this problem. Often this was related to bad contacts inside the keyboard. This is a fix proposed by several people:
I resolved this by rolling some soft household metal sponge [...] into a small ball and dropping it directly on the contact, then jamming in the batteries. Don't worry, the case will close (my ball was about 75mm in diameter). [...] It is nevertheless important that the metal sponge doesn't touch the casing, this could cause a shortcircuit.