Dear Robert,
If it is only showing yellow lights after initial power up, I think it has a hardware fault issue, I don't think anyone can help by remoting on to your system, make sure you have at least 1 antenna connected with you reader, if you are powering with an adaptor, maybe change the adaptor with a new one (24V) if you have poe power option maybe try that. also you can try hard reset the reader by using a paper clip and press and hold the reset button on the back of the reader for 10 sec while the power is still on and let go to see if the reader reset fixes your problem or not, if not I think the reader might be damaged.
Regards
Tanvir