on board High Speed data port

Hello

I was wondering if I could get some technical support.

I was using the system with the on board factory high speed data port, which connects to the cat 5 wire.

The next day the system would not connect to the internet. I checked the Cat 5 wire by hooking up my lap top and it works fine.

Usually when I have the ct 5 wire hooked up, the high speed data port has a little green light on it  lit up. Now that little green light is yellow.

I thought I could just hook up another high speed data port. So I opened the case and put in another high speed data port.  That doesn't work either and it doesn't light up.

QUESTION is there a way to turn on and off the ion board data port?  I think the non factory high speed data port just automatically works.

Anyone know how to turn on and off the on board

Thanks  scott burry