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How to Tell If It's Your ISP or Your Computer

When the connection drops, you need to know one thing fast: is it your ISP or your computer? Calling your internet provider when the problem is on your end wastes an hour; rebooting your laptop when the provider is down wastes the whole evening. This guide walks you through simple checks that tell you exactly where the fault lies — so you spend your time on the right fix.

First, check more than one device

Your provider (ISP) delivers internet to your whole home. Your computer only affects itself. That difference is the key to telling them apart.

  • Grab a phone, tablet, or second computer on the same Wi-Fi.
  • Try loading a few websites or apps.

Read the result:

  • Everything is down on every device → the problem is your network or your ISP, not one computer.
  • Only your computer has trouble → the ISP is fine; the issue is your machine. (Our guide on Wi-Fi vs computer covers that case in detail.)

Test over mobile data

This separates "the internet itself is down" from "my Wi-Fi is down."

  1. Turn off Wi-Fi on your phone so it uses mobile data.
  2. Try the same websites again.

If they load over mobile data but nothing on your home Wi-Fi works, the problem is inside your home — your router, modem, or wiring — or with the ISP's line into the house. If even unrelated sites are flaky on mobile too, it may just be the sites themselves.

Look for an ISP outage

Providers have outages, and they often won't tell you proactively.

  • On your phone's mobile data, search your provider's name plus "outage."
  • Check the provider's app or status page — most have one.
  • A quick search for your provider on a service-status site will show if others nearby are reporting problems.

If there's a known outage in your area, there is nothing to fix on your end. Wait it out and check for updates.

Check the lights on your modem and router

Your modem talks directly to the ISP, and its lights tell a story.

  • A steady internet or online light usually means the ISP connection is healthy.
  • A blinking or red light, or a light that's off entirely, often means the ISP signal isn't reaching you — a line or provider problem.

If the modem can't get a signal at all, that's an ISP-side issue. Note what the lights are doing; it's the first thing support will ask.

Restart the modem and router

This clears the most common temporary faults and sometimes nudges your ISP connection to re-establish.

  1. Unplug the modem (and router, if separate).
  2. Wait a full 30 seconds.
  3. Plug the modem back in first and let it fully come online — this can take two to three minutes.
  4. Plug the router back in and wait for it to settle.
  5. Test again.

If this restores the connection, the fault was a temporary one between you and the ISP. If the modem still can't get online, it's time to contact your provider.

Run a speed test and compare to your plan

Sometimes the internet "works" but is far slower than you pay for. That's often an ISP problem.

  • Run a speed test on a device that's connected.
  • Compare the result to the speed your plan promises.

What it means:

  • Speeds are far below your plan on every device → likely an ISP issue or line congestion. Worth a call.
  • Speeds are fine but one device is slow → the ISP is delivering; the problem is local. See why your internet is slow on only one device.

When it really is your computer

If only your machine struggles while everything else is fine, the ISP is off the hook. Common local causes:

  • A background update or download hogging the connection.
  • Too many browser tabs or apps using memory.
  • A Wi-Fi adapter or driver that keeps dropping.
  • Your computer too far from the router with a weak signal.

A quick restart of just the computer fixes many of these.

Tip

Before you call your ISP, write down three things: whether other devices work, what the modem lights are doing, and your latest speed test result. Support will ask for all three, and having them ready cuts the call in half.

The fast way: get a clear verdict in seconds

All of these checks work, but they take time and a steady hand. Acutis Go runs them for you automatically and tells you in plain English whether it's the network, the ISP, or your machine.

It's a free, ~7 MB app that sits quietly on your computer and continuously watches your internet status, latency, public IP, gateway, DNS, Wi-Fi signal, a built-in speed test, and your computer's own health. From that it produces a clear verdict with a confidence score — so you know who to call before you pick up the phone. It's observe-only and never changes any setting on your computer or network.

It also gives you a six-character support code you can read out instead of reciting IP addresses to your provider — the end of the worst support call. The verdict is computed right on your machine and works even when you're offline.

Install free at https://get.acutisgo.com.