Rechargeability is an essential laptop feature. Once it starts to have charging problems, the device immediately loses its mobility. The most common problem with laptops is the inability to identify the plugged charger. That’s why you get the “AC power adapter wattage and type cannot be determined” alert on your screen.
In most cases, you can solve this issue at home. All you need is a fine troubleshooter. Check this 5-step guide from Howly experts that can help you fix this problem in less than an hour.
This message notifies you that the laptop can’t identify the charger. Power connectors usually have at least three pins. The two of them are the “Power” and “Earth” (they are mandatory to any electrical system). And the last one is the signal line which helps your PC identify PCU as compatible.
When the laptop doesn’t get the signal from the third line, it blocks the charging process. It also protects the computer from voltage ups and downs.
If you ignore the “AC power adapter type cannot be determined” memo, your device will continue charging. But system performance will go down in a few months (or even weeks). You can restore it to its original meaning once you find and fix the power adapter issue. Here are the most common causes:
Some people consider that the “AC power adapter wattage” alerts outcomes from the broken battery. While in reality, accumulators have nothing to do with it. You’ll get the same memo with or without inserted battery.
You have four ways to solve this issue at home. If this alert is too annoying for you, you can temporarily disable it. But beware that power issues will continue to influence the workflow.
Once you are ready to fix the issue, power cycle the laptop and switch off external devices. Plug them one by one to see which may cause the malfunction. If the laptop still glitching, find a new charging cable and try to charge the laptop with it. Check the device for dust, it may be just a clogged port.
But if you still see the “AC wattage” notification, it’s mostly a broken power jack. If you want to fix it at home, you need a personalized hardware guide. Contact Howly to get a tailored troubleshooter. But if you are unsure about your skills, go to the nearest repair service.
If you can charge your laptop but continue receiving the “AC Power adapter and wattage cannot be determined” memo, use this temporary trick. Just disable this warning.
Note that this action doesn’t solve your issue. But it allows you to finish your work without this annoying notification. Here is the tutorial:
Reboot the laptop as usual. It should hide the AC power adapter wattage and type alert at least for the next few days. But don’t let this silence trick you.
There is still a charging issue with the device. And you should fix it as soon as possible, otherwise, the laptop won’t get enough power to fully supply its hardware. It leads to a fast wear-out, so your laptop will break earlier than it should.
Wired external devices often consume energy directly from the PC. But sometimes those devices are too powerful, so laptops can’t give the needed power.
At the same time, the laptop tries to receive energy from a power grid as much as possible. And it leads to various glitches, including the “AC power adapter wattage” alert. Power cycling could fix this issue:
If your laptop has a non-removable battery, discharge it until it shut downs automatically. Charge it, as usual, to check if you still have the “AC Power adapter” alert.
Often, it’s enough to fix this problem. If everything is fine, don’t plug back all external devices immediately. Connect them one by one to see which gadget led your laptop to this alert.
If this solution helps, the charger cord and port are completely fine. There is no need to worry about them. But if you still see this alert, check the charger and power jack.
If you frequently catch this alert, check the charger. It can be the issue’s source. Plug the existing adapter into the other suitable device.
If it declines to charge, the problem hides in the adapter. For those who don’t have a spare laptop — go to the nearest shop and plug your device into the new charger. If it starts to charge without alerts, your current charger is the problem. Buying a new one will be the fastest resolution to the issue.
If you don’t want to buy a spare charger, try to fix yours. Contact the Howly technicians to get a tailored hardware troubleshooter. If you don’t have repair skills, please bring a charger to the service center.
If you decide to buy a new charger, take into account the wattage (like 40W,110W, 160W), the voltage (11V, 14V), and the current (1A,2A, 2,5A) of your present charger. Make sure that your new charger fits the same numbers.
Otherwise, it won’t let your laptop charge properly. In the best-case scenario, you’ll see the same AC alert. In the worst case, the wrong cord could break the laptop’s hardware the second you plug it in. It would be better, to spend extra 10-15 minutes to double check, rather than buying a new device.
A broken jack may be a reason why your laptop is not charging and showing you the “AC Power adapter wattage disabled in BIOS” alert. It’s a common issue with old (4+ years) devices. If you use a laptop in challenging circumstances (e.g., airports, bars), its charging port may wear out quickly.
The easiest way to point it out is to observe how the laptop acts in different circumstances. Look for the following signs:
Follow the troubleshooter to repair AC power adapter issue from excessive clogging:
Warning! Fix a jack only if you have strong repair skills. If you are unsure about them, go to the closest service center. If the device is under warranty — reach the manufacturer. You may get a free repair if your situation falls under the warranty case.
Your laptop can’t identify this cable as compatible. Power cycle the device and eject external devices. Try to charge the computer with another wire. If you still see this memo, your laptop has a broken power jack.
Only if it has the same wattage, voltage, and current. Otherwise, it won’t work and may break the laptop.
You should open BIOS settings. Turn it off. Restart the laptop and press F2 while booting. It may be also F8, F10, F12, or Delete button. It depends on the manufacturer. Go Advanced → Adapter warning → Disable. Press F10 to confirm adjustments and restart the device.
There are four ways to troubleshoot the “AC power adapter cannot be determined” issue. Temporarily disable the alert, if it's too annoying. Power cycle the laptop and unplug every external device.
If this didn’t help, check out a charger. There may be problems with the cable. Fix it or buy a new one. In some cases, purchasing a new cord is a more profitable solution compared to repairing an old one.
Check the power jack. It may be clogged or wobbly. If the jack is full of dust, turn on the hairdryer and direct a cool airflow from it to a port. But if it’s shaky, you should replace it. Repair it at home only if you are confident in your restoration skills. If you are unsure about it, go to the nearest repair station.