Can you describe your network? Cable modem? Separate router, separate wifi or all in one ?
What did you disconnect or connect exactly?
What lights are on, on the switch?
How many lan ports on the router?
What do you mean by having issues?
Possibles: Bad cabling Bad switch Unplugged WAN Second DHCP (router) connected to switch
In my experience, the cabling isn't all plugged in once it has been run. Look through the box for unplugged cabling and try plugging them all in. Try the phone cables too if they're terminated the same.
If you don't see any loose cables, open the cover for the one near the router and see if the jack is terminated or if it's just left open.
Connect one port on your router to the switch using any port. Then connect other devices to the remaining open ports. It seems the cabling is good.
If possible move the router and isp device to the cabinet.
I think the Ethernet port ( wall jack to the switch) you are connecting to is wired for telephone or damaged.