Both LEDs solid on means either that the AP is booting, or it is adopted but not configured. Since it is not adopting, I suspect that this AP is stuck i the boot process and may need replacement. If you check the port statistics on the switch port it is connected to, I would not expect to see any packets received. In EXOS, this command would be 'show port <port#> statistics'. If the RX counter is not incrementing, I would suggest opening an RMA with GTAC.