I have an OBi200, which works fine with an ethernet wire plugged in. I bought two OBIWIFI5G and tried both of them, but neither has a blue light that turns on.
Please advise.
See http://www.obihai.com/wifi. Ensure you have up to date firmware on the OBi200. http://www.obitalk.com/forum/index.php?topic=9.0. If updating manually the "latest" link on that page gives 5463 despite saying that 5264, May 2016 is the latest.