Updated November 2, 2026 · The Computer Hospital, Midtown Houston
Your laptop says "plugged in, not charging," the battery percentage won't climb, or it dies the moment you pull the plug. There are three usual suspects: the battery, the charging port (also called the DC jack) and the power adapter. On our bench, that's also the order we find them in — a worn-out battery is the most common cause, then the charging port, then the adapter.
Here's how to tell which one you're dealing with, what you can safely check yourself, and when to bring it in.
Read the symptoms
How the laptop behaves tells you a lot before anything is opened:
- Works fine plugged in, dies within minutes on battery → almost always a worn-out battery.
- Charges only when the cable is held at a certain angle, or the charging light flickers when you wiggle the plug → the charging port (DC jack) is loose or broken.
- Nothing happens at all — no charging light, no power even when plugged in → often the adapter or its cable, sometimes the port or the board.
- "Plugged in, not charging" with the percentage stuck → can be a worn battery, the wrong or underpowered charger, or a battery setting that deliberately stops charging at 80% to protect the battery.
- The laptop shuts off suddenly at 20–40% → the battery can no longer deliver power under load. It's worn out.
Cause #1: a worn-out battery
Laptop batteries are consumable parts. After a few years of charging and heat, they hold much less charge and can't keep up with the laptop's demand. You'll often see a warning like "Service battery," "Consider replacing your battery" or "Replace soon."
Check it yourself:
- Windows: open Command Prompt and type
powercfg /batteryreport. It saves a report showing the battery's design capacity and its full charge capacity today. If today's number is far below the design number, the battery is worn. - Mac: open System Settings → Battery and look at Battery Health, or hold Option and click the battery icon in the menu bar.
A worn battery isn't dangerous by itself, but worn batteries are the ones that eventually swell — so don't put off replacing one that's clearly failing.
Cause #2: a broken charging port (DC jack)
The charging port takes a beating: plugs yanked out sideways, laptops dropped while charging, cables tripped over. Inside, the jack can crack, the pins can bend, or the solder joints holding it to the motherboard can break. The classic sign is charging that comes and goes when the plug moves.
On many laptops the jack is a separate part on a short cable; on others it's soldered right to the motherboard. Either way, it's a repair for the bench, not the kitchen table. Don't force the plug in or bend it to "find the spot" — that can short the port and damage the board.
At The Computer Hospital, DC jack (charging port) replacement starts at $115, for PC laptops and MacBooks. We quote the exact part for your model before any work starts.
Cause #3: a failed power adapter or cable
Adapters fail too — usually the cable right where it enters the brick or the plug, where it bends most. Look for fraying, kinks, exposed wire or a plug that's discolored or loose.
- Make sure the outlet works by plugging something else in. Skip the power strip for this test.
- Check that the adapter's wattage matches or exceeds what your laptop needs. A lower-wattage USB-C charger may keep the laptop running but not charge it.
- If you have another manufacturer-approved charger for the same model, try it briefly.
- Don't use an adapter with a damaged cable. Cheap no-name replacements can also cause charging problems.
Less common: the motherboard's charging circuit
If a good battery, a good port and a good adapter still don't charge, the problem is likely in the charging circuitry on the motherboard. That takes board-level diagnosis. We'll tell you what we find and whether the repair makes sense for the laptop's age and value before doing anything.
What happens when you bring it in
- Free limited diagnostic. We test the adapter, check the port, and read the battery's health and charge data.
- A clear answer: battery, port, adapter or board — and the price before any work starts.
- Repair: many common battery and port repairs are done same day or next day, depending on parts.
- Your old battery is recycled. We dispose of every battery we replace.
Repair labor is backed by our 90-day labor warranty; parts carry their own warranty.
Frequently asked questions
Why does my laptop say "plugged in, not charging"?
Most often the battery is worn out. It can also be an underpowered or wrong charger, or a battery-protection setting that pauses charging at 80%. Check the battery report or battery health first.
Can I use my laptop without a battery, plugged in?
Some laptops can, but you'll lose any unsaved work if the plug is bumped or the power flickers. A worn battery can also start to swell, so it's better to replace it.
How much does it cost to fix a laptop charging port?
At The Computer Hospital, charging port (DC jack) replacement starts at $115, with the part quoted for your exact model before we start.
Is a laptop that won't charge worth fixing?
Usually, yes. Batteries, ports and adapters are among the most affordable laptop repairs. If the problem turns out to be the motherboard on an older laptop, we'll tell you if replacing the computer makes more sense.
Do you fix MacBooks that won't charge?
Yes. We work on MacBook Air and MacBook Pro charging problems as well as Windows laptops.
Laptop won't charge? Bring it to 3512 Travis Street in Midtown — no appointment needed for in-shop visits — or call (713) 472-4357. Pickup, diagnosis and return delivery inside Beltway 8 is $99.
Related: swollen laptop battery · computer won't start · laptop repair
Computer Hospital · Houston since 1986
Need help with this issue?
Bring us the symptoms and the steps already tried. We can discuss an appropriate evaluation and explain your service options before any paid work begins.