Start by checking what's actually broken

A charger that doesn't work usually fails at one of three points: the power outlet itself, the cable, or the charging port on your computer. Most of the time it's the cable — the part that flexes and bends every time you move your laptop. Before you buy a replacement, spend five minutes testing which part is actually dead.

Plug the charger into a different outlet in another room. If your laptop starts charging, the outlet was the problem, not the charger. If it doesn't charge, try plugging something else — a lamp, a phone charger, a coffee maker — into the original outlet. If that device works, you know the outlet is fine and the charger is the issue.

Key Takeaways

  • Most charger failures happen in the cable itself because it bends and flexes constantly, not in the power brick or your computer's port.
  • Test the outlet first by plugging in a different device, then test the charger on a different outlet to narrow down what's broken.
  • Look for visible damage on the cable — kinks, fraying, exposed wires, or a cracked connector — which usually means replacement is your only option.
  • If the cable looks fine but still doesn't charge, the problem is likely the charging port on your computer or the internal components of the power brick.
  • Replacement chargers cost between $30 and $150 depending on your computer brand and model, so buy the right one for your specific machine.

Inspect the cable for visible damage

Look at the entire length of the charging cable, especially where it connects to the power brick and where it plugs into your laptop. Bend it gently with your hands and watch for any cracks, kinks, or exposed copper wires. If the outer plastic coating is torn or the connector is cracked, the cable is damaged and needs to be replaced.

Pay special attention to the part of the cable closest to the power brick — this is where most cables fail because it gets bent and twisted when you wrap it up. If you see a bulge, a flat spot, or discoloration in that area, the internal wires are likely broken even if the outer coating looks okay. A damaged cable is a fire and shock hazard, so don't try to repair it with tape.

Test the charging port on your computer

If the outlet works and the cable looks fine but your laptop still won't charge, the problem is likely the port where the charger plugs in. Look at the port on your computer with a flashlight. The connector should be centered and straight, not bent or pushed to one side.

Gently try plugging the charger in at different angles — sometimes a slightly loose connection will charge if you position the cable just right. If you have to hold the cable at a specific angle for it to work, the port is damaged and your computer will need professional repair. If the port looks bent or broken, don't force the charger in, as you could damage it further.

Check whether the power brick itself is broken

The power brick — the box part of the charger — rarely fails compared to the cable, but it can happen. If the cable looks fine, the outlet works, and the port looks straight, feel the power brick with your hand. It should be warm but not hot. If it's extremely hot to the touch or if you smell burning plastic, unplug it when ready and don't use it.

Some power bricks have a small light on them that turns on when they're working. If that light doesn't come on when you plug it in, the brick itself is dead. You'll need to replace the entire charger. If the brick is warm, the light is on, but your computer still won't charge, the problem is almost certainly the port on your computer.

Buy the correct replacement charger for your model

Chargers are not universal — a charger made for a Dell laptop won't work with a Lenovo, and a charger for an older model may not work with a newer one. Before you buy, find your computer's exact model number. On Windows, right-click the Start button, select "System," and look for "Model" or "Product Name." On a Mac, click the Apple menu, select "About This Mac," and look for "Model Name."

Go to the manufacturer's website or a major electronics retailer and search for that exact model plus "charger." You'll see the correct wattage and connector type listed. Write down the wattage — it's usually printed on the old charger as well, like "65W" or "90W." Buying the wrong wattage can damage your computer, so match it exactly. Replacement chargers typically cost between $30 and $150 depending on your brand and model.

Understand the difference between USB-C and proprietary chargers

Newer laptops, especially thin models, often use USB-C charging — the same connector as many phones and tablets. If your charger has a USB-C port, you may be able to use a USB-C charger from another device temporarily, as long as the wattage is the same or higher. A 65W USB-C charger will work with a laptop that needs 45W, but not the other way around.

Older laptops use proprietary connectors — special plugs designed only for that brand. These chargers are not interchangeable. If you have a Dell with a barrel connector or a Lenovo with a rectangular connector, you must buy a charger made for that specific type. Check your manual or the manufacturer's website to confirm which type your computer uses.

Prevent future charger failure

The cable fails fastest when it's bent sharply or wrapped tightly. Instead of coiling the cable in a tight loop, wrap it loosely in a figure-eight pattern or use a cable organizer. Never yank the cable out of the port — grip the connector itself and pull straight out. Avoid running the cable under your desk leg or letting it hang over a sharp edge.

Keep the charger away from heat sources like radiators, direct sunlight, or the back of your computer where vents are. Heat degrades the internal components and the plastic coating. If you travel frequently, consider buying a second charger to leave at home or the office instead of moving one charger back and forth constantly.

Frequently Asked Questions

Can I use a phone charger to charge my laptop?

Only if your laptop has USB-C charging and the phone charger has enough wattage. A typical phone charger is 18W to 30W, but most laptops need 45W or more. Using too low a wattage will charge very slowly or not at all. Check your laptop's manual for the required wattage before trying this.

Is it safe to use a charger that gets really hot?

Chargers should be warm but not hot enough to hurt your hand. If it's too hot to touch, unplug it when ready. Excessive heat means the internal components are failing and there's a risk of fire or damage to your computer. Replace it with a new charger rather than continuing to use it.

Why does my charger work sometimes but not other times?

This usually means the cable has a broken wire inside that only makes contact when the cable is bent a certain way. This is dangerous because the connection is unstable. You need to replace the charger. Don't keep using it, as it can damage your computer's charging port or cause a short circuit.

What's the difference between a 45W and 65W charger?

The wattage determines how fast your laptop charges and how much power it can deliver. A higher wattage charges faster, but using the wrong wattage can damage your computer. Always match the wattage to what your laptop manufacturer specifies — it's printed on the old charger and in your manual.

Can I fix a frayed charging cable with electrical tape?

No. Taping a damaged cable is a temporary fix that creates a fire hazard. The internal wires may be damaged even if you can't see them, and tape doesn't restore the insulation. Replace the charger instead. It's safer and cheaper than dealing with a damaged laptop or electrical fire.