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!
The power button is on the right hand side, it's part of the "tube" at the back and clearly marked with a power button symbol.
Did you check the batteries as well?
Many people have experienced this problem. Often this was related to bad contacts inside the keyboard. This is a fix proposed by several people: