Wi-Fi Troubleshooting Flowchart

Nothing can get online — phones, laptops, and TVs all fail. This usually points to the modem, router, or your internet provider rather than any single device.

Most likely cause: Modem/router needs a restart, a loose cable, or an outage on your provider’s side.

1. Check the physical cables. Make sure the coax/fiber/DSL line into the modem and the cable between modem and router are firmly seated.
2. Look at the modem lights. A missing or red “internet/online” light usually means the signal from your provider is down, not your Wi-Fi.
3. Do a full modem + router restart (see the Safe Restart steps below).
4. Check for a provider outage. On your phone using mobile data, search your provider’s name + “outage,” or check their app/status page.
5. If only the router (not the modem) shows a problem, connect a laptop directly to the modem with an Ethernet cable to see whether the internet itself works.

Still stuck? If the modem shows no internet signal after a restart, or your provider confirms an outage, this is an ISP issue — contact your internet provider. If the modem is fine but Wi-Fi still won’t work, it points to the router.

Everything else is online, but one phone, laptop, or TV won’t join the network. The problem is almost always on that single device, not your Wi-Fi.

Most likely cause: A stale saved network, wrong password, airplane mode, or a device that needs a restart.

1. Restart the device. Fully power it off and on — this alone fixes many single-device issues.
2. Confirm Wi-Fi is on and airplane mode is off.
3. Forget the network, then rejoin it and re-enter the password carefully (passwords are case-sensitive).
4. Move closer to the router to rule out a weak signal or dead spot.
5. Check whether the device is blocked — some routers have a device/MAC filter or parental-control schedule that can lock a device out.

Still stuck? If the device still won’t connect to any Wi-Fi network (not just yours), the device’s wireless hardware may be at fault — a technology expert or the device manufacturer can help.

Your device says it’s connected, but pages won’t load. The link to the router is fine; the path to the wider internet is broken.

Most likely cause: Modem/provider issue, an IP address that didn’t assign correctly, or a DNS problem.

1. Test a second device. If it also has “connected, no internet,” the problem is your modem or provider, not the device.
2. Do a full modem + router restart (Safe Restart steps below).
3. On the affected device, toggle Wi-Fi off and on to force it to request a fresh IP address.
4. Try loading a site by name (example.com) and, if that fails, ask someone to confirm the site is up — this helps separate a DNS problem from a full outage.
5. If only one device shows “no internet,” forget and rejoin the network on that device.

Still stuck? If every device is connected but has no internet after a restart, contact your ISP — the fault is likely between the modem and their network.

Everything is online but sluggish. Pages crawl, video buffers. When it’s slow everywhere at once, look at the connection and the router, not one device.

Most likely cause: Network congestion, an overloaded router, too many devices, or you’re not getting the speed you pay for.

1. Run a speed test (search “speed test”) on a device near the router, and compare the result to the plan you pay for.
2. Restart the router — routers slow down over long uptimes and a reboot often restores speed.
3. Check what’s using bandwidth: large downloads, cloud backups, game/console updates, or many 4K streams can saturate a connection.
4. Reduce interference: place the router in the open, elevated, away from microwaves, cordless phones, and thick walls.
5. If your router is several years old, it may not support the speeds of your current plan.

Still stuck? If your measured speed is far below your plan even right next to the router and after a restart, contact your ISP. If speeds are fine near the router but poor elsewhere, a technology expert can advise on router placement or a mesh/extender.

Other devices are fast; one is slow. The issue is that device or its distance from the router — not the internet connection itself.

Most likely cause: Weak signal/distance, an overloaded device, or too many background apps.

1. Move the device closer to the router and re-test — signal strength drops fast through walls and floors.
2. Restart the device and close heavy background apps or downloads.
3. Check for updates that may be downloading in the background.
4. On phones/laptops that support it, connect to the 5 GHz network (faster, shorter range) when near the router, or 2.4 GHz (slower, longer range) when far away.
5. Test the same task on another device in the same spot to confirm it’s device-specific.

Still stuck? If one device is consistently slow everywhere in the home while others are fine, its wireless adapter may be failing — a technology expert or the manufacturer can help.

The connection keeps dropping and reconnecting. Intermittent problems are the hardest to catch but usually trace to signal, overheating, or a failing device.

Most likely cause: Interference, an overheating or aging router, a loose cable, or provider line noise.

1. Note the pattern: does it drop at certain times, or only far from the router? Timing is a big clue.
2. Make sure the router is ventilated and not hot to the touch — overheating causes random drops.
3. Re-seat all cables at the modem and router; a slightly loose coax/fiber line causes intermittent loss.
4. Do a full modem + router restart, and if your router firmware has an update available, apply it.
5. If drops happen mainly in one area, it’s a coverage/dead-spot issue rather than a fault.

Still stuck? If drops affect every device at random and continue after a restart, ask your ISP to check your line for signal noise. Persistent dead spots are best solved with better placement, a mesh system, or an extender — a technology expert can recommend the right fix.

A light on the modem or router is red, orange, or off instead of the normal solid/steady color. Each light points to a different part of the connection.

Most likely cause: The specific light tells you where the break is — power, the provider signal, or the internet link.

1. Power light off: the unit has no power — check the adapter and outlet.
2. Internet/online light red or off: the signal from your provider is missing — usually an ISP-side issue or a loose incoming line.
3. Wi-Fi light off: wireless is disabled — there may be a Wi-Fi button on the router, or it needs a restart.
4. Do a full modem + router restart and watch the lights come back in order.
5. Check your router’s label or manual — light meanings differ by brand and model.

Still stuck? If the internet/online light stays red or off after a restart, contact your ISP — the signal isn’t reaching your modem. Consult your router’s official manufacturer documentation for the exact meaning of its lights.

You’re online and most things work, but certain websites or apps won’t load while others do. This pattern often points to DNS — the system that turns website names into addresses.

Most likely cause: A DNS hiccup on your provider’s servers, or cached bad data on your device.

1. Confirm it’s not just one site being down — try the site on mobile data, or check a “is it down” service.
2. Restart the device to clear its temporary DNS cache.
3. Restart the router so it re-fetches DNS from your provider.
4. Test whether switching to a well-known public DNS resolver helps — this is a common, safe fix, but change it back if it doesn’t improve things.Caution: Only change DNS settings you understand; write down the original values first so you can restore them.
5. If it’s work or school apps specifically, a VPN or firewall on that network may be the cause.

Still stuck? If many sites fail across all devices and restarts don’t help, contact your ISP and mention you suspect a DNS problem. A technology expert can help configure DNS safely if you’re unsure.