Static Noise in my computer

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On May 17th, I went to the computer repair shop in town to replace the battery for my laptop. I had been using this battery for six years, and finally it couldn’t hold up anymore. So I walked 25 li (12,500 meters) to Chouka Town, then took a bus to Fincho Town to get my laptop repaired. I waited for one day, and on May 19th, the repair technician called me to pick up my laptop. I walked another 25 li, feeling completely exhausted. I took a shower, changed clothes, drank some milk, and spent the entire afternoon resting at home. In the evening, around 7 p.m., I turned on my laptop, put on my headphones, and was ready to listen to music. Then I noticed that when the laptop was plugged into the charger, it made some static noise. I wasn’t sure whether it was due to the technician’s lack of professionalism or the aging laptop charger. So all night, I searched online for ways to fix the static noise in the headphones. I tried various methods, updated the sound card driver, and disabled the microphone, but nothing worked. Fortunately, the noise disappeared as soon as I unplugged the charger. Still, I wasn’t satisfied. Tomorrow, I will call the technician to find out exactly where the problem lies and figure out how to fix it. Of course, I won’t go out in May. To get to the technician, I have to walk 25 li every day, and I simply can’t handle that. I’ll wait until our local bus service resumes and find a cloudy day to go out and have the technician inspect the problem again. Now I have some ideas: either replace the charger, or get a USB with a headphone jack. I’ll need to discuss the details with the technician to know for sure. That’s all. I wish everyone happiness.