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Short answers for common light states and brand-specific router or modem warnings.
Netgear separates Power, Internet, wireless bands, Ethernet, and WPS. The Internet LED is the key one when service is down.
A blinking Netgear Internet light can mean the router is trying to reach the modem or WAN. It is not usually solved by changing Wi-Fi names.
Amber often means limited speed, WAN trouble, startup, or port negotiation. The exact meaning depends on the label next to the LED.
A blinking power light can mean booting, firmware work, or recovery. Repeated blinking after a long wait may mean firmware or hardware trouble.
Netgear modems usually separate downstream, upstream, online, Ethernet, and power. Online steady matters most for service.
Arris lights are usually read by Power, Receive, Send, Online, Wi-Fi, and Ethernet. Online is the key service light.
Blinking green on Arris receive, send, or online usually means the modem is trying to lock signal or register service.
Blue on many Arris models can mean a faster bonded channel or active high-speed link. It is often normal when steady.
If the Arris Online light keeps blinking, the modem has not completed registration. The service side is not ready yet.
US or DS blinking means upstream or downstream signal is not fully locked. Splitters, damaged coax, or provider signal can cause it.
TP-Link lights usually show Power, Internet, Wi-Fi, LAN, WPS, and USB. Orange Internet points outside Wi-Fi first.
Orange on TP-Link usually means WAN trouble or limited service. Local Wi-Fi may still appear active.
WPS blinking means the pairing window is open. It should stop after pairing succeeds or times out.
ASUS routers often expose WAN, wireless bands, LAN, power, and WPS. A red WAN or Internet light is the one to treat seriously.
A red ASUS WAN or Internet light usually means the router cannot reach the modem or provider. Start with the WAN path.
WAN off usually means the router does not detect a cable or upstream device. The modem may be off or the cable may be bad.
Motorola modems commonly show power, downstream, upstream, online, and LAN. Startup blinking is normal; endless blinking is not.
Blinking green on downstream or upstream usually means the modem is trying to lock cable signal.