I have a WF-803M that has a coax cable running from the wall to the TV port. I have it plugged into power and I have the ethernet plugged into my computer. I have used this in the past without a problem but didn't use it for a while. I'm trying to use it again and now it won't work. The power light is on and the LAN light flashes but I don't have any lights on the MoCA light. Any idea how I can troubleshoot this?