Your charger, battery, or charging port is likely broken or disconnected

When your computer won't charge, the problem is almost always one of three things: the power adapter has failed, the battery itself is dead, or the charging port is damaged or loose. Your computer's charging system is straightforward — the adapter converts wall power to the right voltage, the port delivers it to the battery, and the battery stores it. If any part of that chain breaks, charging stops. The good news is that you can usually figure out which part is failing by testing a few things yourself, and most fixes are cheap.

Start by checking whether your computer is actually trying to charge. Look for a light on the power adapter itself, a light near the charging port on your computer, or an icon on your screen that shows a plug or battery. If you see nothing, the adapter is probably dead. If you see a charging light but the battery percentage doesn't move after 30 minutes, the battery or port is likely the problem.

Key Takeaways

  • A dead power adapter is the most common cause — look for a light on the adapter or near the charging port to tell if power is reaching your computer at all.
  • Inspect the charging cable for damage, and try plugging it into a different outlet to rule out a tripped breaker or dead circuit.
  • If the port looks bent, corroded, or loose, the charging port itself may need replacement rather than the battery.
  • Batteries degrade over time and may stop accepting a charge after 3 to 5 years of regular use, even if the adapter and port work fine.
  • A replacement power adapter costs $30 to $80 for most laptops, while a new battery runs $50 to $150 depending on the model.

Test the power adapter first

The power adapter is the easiest part to test because you can see whether it is working. Look at the adapter itself — most have a small light that glows when plugged in. If that light is off, unplug the adapter, wait 10 seconds, and plug it back in. If the light still does not come on, the adapter is dead and needs replacement.

If the adapter light is on, check the cable where it connects to the adapter and where it connects to your computer. Bend the cable gently near both ends — sometimes a cable breaks inside the rubber coating and only works at certain angles. If the light flickers when you move the cable, the cord is damaged and the adapter needs replacement.

Also try plugging the adapter into a different outlet in another room. If it works there, your original outlet may have a tripped breaker or a dead circuit. Check your breaker box or ask someone in your home to test that outlet with a lamp.

Check the charging port and cable connection

Once you know the adapter is sending power, look at where the cable plugs into your computer. The port should be clean, with no visible corrosion, bent pins, or debris. If you see white or green buildup inside the port, that is corrosion — unplug the adapter and gently clean the port with a dry cotton swab or a small brush. Do not use water or liquids.

Try unplugging and replugging the cable several times. Sometimes the connection is just loose. If the cable only charges when you hold it at a certain angle, the port is damaged and will need to be replaced by a repair shop or the manufacturer. This usually costs $40 to $100 in labor plus parts.

For desktop computers, check that the power cable is fully seated in the back of the case and that the wall outlet works. Use a different cable if you have one available — sometimes the cable itself fails even though the adapter is fine.

Understand how batteries age and fail

Laptop and tablet batteries degrade every time they charge and discharge. After 300 to 500 full charge cycles — roughly one to two years of daily use — a battery starts to hold less charge. After 1,000 cycles or three to five years, many batteries stop accepting a charge altogether, even if the adapter and port are fine.

You can check your battery's health on Windows by opening Command Prompt, typing powercfg /batteryreport, and pressing Enter. This creates a file showing how much capacity your battery has lost. On Mac, hold Option and click the battery icon in the menu bar to see the battery condition. If it says "Replace Now" or shows capacity below 50 percent, the battery is failing.

If your computer is more than three years old and the adapter and port are working, a new battery is usually the answer. Batteries are not repairable — they must be replaced. For most laptops, this costs $50 to $150 depending on the model, plus labor if you take it to a shop.

When to replace the adapter versus the battery

A replacement power adapter is the cheapest fix and the most common one. You can buy a new adapter from the manufacturer, from electronics retailers, or from third-party makers. Make sure the voltage and connector type match your original — this information is printed on the old adapter. A replacement usually costs $30 to $80.

If the adapter is working but the battery will not charge, you have two options: replace the battery yourself if your computer model allows it, or take it to a repair shop. Many modern laptops have batteries glued in, which means a technician has to disassemble the whole computer. Older laptops often have a removable battery you can swap yourself in under a minute.

Check your computer's manual or search online for your exact model number plus "battery replacement" to see whether it is user-replaceable. If it is, you can buy a replacement battery online for $50 to $150 and install it yourself. If it is not, a repair shop will charge labor on top of the battery cost.

Troubleshoot software settings that block charging

Rarely, a computer will refuse to charge because of a software setting or driver problem rather than a hardware failure. On Windows, go to Settings, then System, then Battery. Look for an option called "Battery Saver" or "Charge Limit" — some computers are set to stop charging at 80 percent to extend battery life. If this is on, turn it off and wait 10 minutes to see if charging resumes.

On Mac, go to System Settings, then Battery, and check whether "Optimized Battery Charging" is on. This feature slows charging to extend battery life, but it should not prevent charging entirely. If it is on and your computer still will not charge, turn it off and restart.

If you have recently updated your operating system or installed new drivers, the charging problem may have started then. Restart your computer in Safe Mode (Windows) or Recovery Mode (Mac) and see if it charges. If it does, a driver or background program is interfering — you may need to uninstall recent updates or reinstall chipset drivers from the manufacturer's website.

When to take it to a repair shop

If the adapter light is on, the port looks clean, and the battery health is good but your computer still will not charge, the problem is likely inside the computer — a failed charging circuit on the motherboard or a loose internal connection. This requires opening the case and is not a safe repair to attempt yourself.

Take your computer to an authorized repair shop for the manufacturer or a local computer repair business. Bring the power adapter with you so the technician can test it on their equipment. Expect to pay $50 to $150 in diagnostic fees, plus repair costs if something needs to be replaced. Some shops will waive the diagnostic fee if you decide to have them fix it.

If your computer is very old or the repair cost is more than half the price of a new one, it may be time to replace it instead. A new budget laptop costs $300 to $500, while repairing an old one can sometimes approach that price.

Frequently Asked Questions

Can I use a different brand charger if it has the same voltage?

Only if the connector type and polarity are identical. Using the wrong charger can damage your computer's charging circuit or battery. Check the connector shape, the voltage (usually 19V or 20V), and the amperage on both adapters. When in doubt, buy the manufacturer's official adapter — it costs more but is may provide to be safe.

Why does my computer charge slowly?

Slow charging usually means the adapter is underpowered for your computer, or the battery is very depleted. Some computers also charge slowly when the battery is cold — let it warm up to room temperature first. If charging is slower than it used to be, the battery may be aging and losing capacity.

Is it bad to leave my computer plugged in all the time?

Modern laptops stop charging once the battery is full, so leaving it plugged in will not overcharge it. However, keeping a battery at 100 percent constantly does cause it to degrade faster. If you use your laptop mostly at a desk, unplugging it occasionally or using a charge limit feature (if available) will extend battery life.

What does it mean if the charging light blinks?

A blinking light usually means the adapter is detecting a problem — often a short circuit or incompatible device. Unplug everything, wait 30 seconds, and plug the adapter back in. If it still blinks, the adapter is failing and needs replacement.

Can I charge my computer with a phone charger?

Only if your computer uses USB-C charging and the phone charger has enough wattage. Most phone chargers are 5W to 30W, while laptops need 45W to 140W depending on the model. Using an underpowered charger will charge very slowly or not at all, and may damage the charger itself.