Chosen Solution
Fan won’t stop spinning, battery won’t show up in status bar, when I try to turn it on in energy saver, it uncheck itself. When I use CoconutBattery, it shows: Full Charge Capacity is : NaNDesign Capacity is : NaNPower adapter: Not connected If I disconnect the power, the laptop will shut off
You need a new battery as the sensor unit within the battery is bad and likely the battery is in need of replacing anyways because of age.
For the fans that keep spinning, look in the CPU section of the Activity Monitor application to see if a power intensive application is running. For the battery. download Coconut Battery to view the status of the battery. If you take out the power adapter out of the Macbook Pro and it instantly powers off, the battery most likely needs to be replaced.
As long as u didn’t damaged anything by urselfe u coud replace the battery. But if spil damage or similar happened, then u need to repair ur battery circuit, since this is related to all this functions.
