RT-AC68U Solid USB 2.0 light

Searched all over but haven't found a solution to this problem. I had the router going for about a week and it was working like a champ, and then it went down one night. Now I can't access the router via web, reset it, or get the router to go into rescue mode. The only other LEDs that come on other than the solid USB 2.0 LED (nothing is plugged into either usb port) are the LAN ports if a cable is connected.
Backstory: flashed a TM-AC1900 to stock ASUS firmware, and then flashed the latest...

RT-AC68U Solid USB 2.0 light