To Cable Forum
Lets start with a few basic questions.
Are you on cable, or ADSL? If the former do you have a cable modem, or Set Top Box? If the latter is the modem ethernet or USB. Cna you confirm make and models please?
Your wired connection are you modem / STB > voyager router > PCs (wired and Wireless), or something else (if so what?)
Have you actually switched off everything, including the modem / STB, all PCs and the voyager, before restarting with wired connections in place. Get a wired connection working first to one PC, then gradually add and connect others.