Start with the power outlet and cable
The first thing to check is whether power is actually reaching your charger. Plug a different device—a phone, lamp, or speaker—into the same outlet your computer charger uses. If that device powers on or charges, the outlet works. If it does not, try a different outlet in another room. Many outlets have a reset button (usually red or black) on the face; press it and try again.
Next, inspect the charging cable itself. Look for visible damage: fraying, cuts, kinks, or places where the rubber coating is worn away. If the cable looks damaged, it needs to be replaced—a damaged cable can fail to conduct power even if it looks like it should work. Bend the cable gently near both ends (where it connects to the power brick and where it connects to your computer) and watch the charging light on your computer. If the light flickers on and off as you move the cable, the connection inside is broken and the cable must be replaced.
Key Takeaways
- Test the outlet with another device first, and press the reset button if the outlet has one.
- Inspect the charging cable for visible damage or kinks, and flex it gently near both ends to check for internal breaks.
- Clean the charging port on your computer and the connector on the charger with a dry cloth or soft brush to remove dust and debris.
- If your computer is very hot, let it cool down before trying to charge again, as many computers stop charging when the battery gets too warm.
- Replace the charger with the correct wattage and connector type for your specific computer model if other steps do not work.
Clean the charging port and connector
Dust and debris inside the charging port can block the connection between the charger and your computer. Unplug the charger from the wall and from your computer. Use a dry cloth or a soft-bristled brush (an old toothbrush works well) to gently clean the metal connector on the end of the charging cable. Then shine a flashlight into the charging port on your computer and look for lint, dust, or corrosion inside.
If you see debris, use a wooden toothpick or a plastic dental pick to gently scrape it out. Do not use metal tools, which can damage the port. If the inside of the port looks corroded or discolored, the port itself may be damaged and may need professional repair. After cleaning, plug the charger back in and check whether the charging light comes on.
Check whether your computer is overheating
Many computers stop charging when the battery temperature gets too high. This is a safety feature to prevent damage. If your computer feels very hot to the touch—especially around the bottom or near the vents—it may be refusing to charge until it cools down. Unplug the charger, shut down your computer completely, and let it sit in a cool room for 30 minutes to an hour.
While it cools, check that the air vents on your computer are not blocked. Dust buildup on vents reduces airflow and causes overheating. Use a can of compressed air to blow dust out of the vents, holding the can upright and using short bursts. After your computer has cooled and the vents are clear, plug the charger back in and try again.
Verify you are using the correct charger
Using the wrong charger—one with the wrong wattage, voltage, or connector type—can prevent your computer from charging. Check the label on your original charger. It will list the voltage (usually 19V, 20V, or 24V) and wattage (usually 45W, 65W, 90W, or higher). The connector type also matters: some are round with a center pin, others are rectangular, and some are proprietary designs specific to one brand.
If you are using a charger that is not the original one that came with your computer, compare the voltage, wattage, and connector type to what the label on your computer says it needs. You can usually find this information on a sticker on the bottom or back of your computer, or in the manual. If the charger does not match, it will not work correctly and you need to get the correct one.
Check the battery and charging circuit
If the charger, cable, port, and outlet all appear to be working but your computer still will not charge, the problem may be inside the computer itself. The battery may be dead or failing, or the charging circuit on the motherboard may be damaged. Some computers display an error message or light code when this happens; check your manual or the manufacturer's website to see what the lights or messages mean.
You can also try a hard reset, which sometimes clears temporary charging problems. Shut down your computer completely, unplug the charger, and press and hold the power button for 30 seconds. Then plug the charger back in and turn the computer on. If this does not work, the battery or charging circuit likely needs professional repair or replacement.
When to replace the charger or seek repair
If you have tested the outlet, inspected the cable for damage, cleaned the port, ruled out overheating, and confirmed you are using the correct charger, but your computer still will not charge, the charger itself or the internal charging circuit is probably faulty. A replacement charger costs between $40 and $150 depending on your computer model and wattage. Before buying a new one, check the manufacturer's website or contact their support line to confirm the exact model and specifications you need.
If a new charger does not solve the problem, the issue is inside your computer—either the battery, the charging port, or the motherboard circuit. This requires professional repair. Contact the manufacturer's support line or visit an authorized repair center. Repair costs vary widely depending on what is damaged, but battery replacement typically costs $50 to $150 and motherboard repairs cost more.
Frequently Asked Questions
Why does my charging light flicker on and off?
A flickering light usually means the connection inside the charging cable is loose or broken. Try flexing the cable gently near both ends to see if the light stays on when you hold it a certain way. If it does, the cable needs to be replaced. If the light flickers even when the cable is still, the charging port on your computer may have a loose connection and needs professional repair.
Can I use a phone charger or a different brand's charger on my computer?
Only if the voltage, wattage, and connector type match exactly. Phone chargers are usually too low in wattage and have the wrong connector. Using the wrong charger can damage your battery or charging circuit. Always use a charger designed for your specific computer model.
What does it mean if my computer charges when it is off but not when it is on?
This usually means your computer is drawing more power than the charger can supply while the computer is running. You may need a higher-wattage charger, or there may be a problem with the charging circuit. Check the wattage on your charger against the wattage listed on your computer's label. If they match, contact the manufacturer for support.
Is it safe to use my computer while it is charging?
Yes, it is safe. However, if your computer is overheating, it may stop charging to protect the battery. If this happens repeatedly, let your computer cool down before using it while plugged in, and make sure the vents are clear of dust.
How long should it take for my computer to charge?
Most computers take two to four hours to charge from empty to full, depending on the battery size and charger wattage. If charging is much slower than this, the charger may be underpowered or the battery may be failing. If it is much faster, the charger may be overcharging, which can damage the battery over time.