Hi! I have the same problem: my orange light stays fixed for a long time, then reboots itself, goes green for a sec, and back to orange fixed light for a long time.
I've tried everything. Unpluging every wire and plugin all of them in manual's order (first lan, then wan, then plug it). I've tried reseting it... but my airport utility doesn't even recognize it.
Any one knows what else to do or suggests anything else to try?