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I have a Macbook Air Retina, late 2019 and the machine has some issues:
When I try the two-step SMC reset I can’t start it again without unplugging the charger cable. And if I unplug, wait ‘10 seconds and replug it, then I am back to square one with the same issues when I boot up the computer.
Anyone knows how to fix this?
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Based on the System info you’ve posted, this sounds like it might be a dud battery. It can see that it’s there. But it cannot see any other data (capacity, cycle count, etc…). I am willing to bet this also includes thermal data since that may also be why your machine is throttling: fan running at max speed, CPU is clocked down to generate less heat. if the system cannot get this thermal information it assumes the worst and runs the system like it’s on fire.
As Dan suggested I would download coconut battery, or run system diagnostics (press and hold D when you power on) to see if you can get some sort of definitive information.
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Let's get a better view of your battery and the charger, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Ajout d'images à une question existante
I also think we need to run the onboard diagnostics, restart your system and press the D key to enter, let us know if you get any errors.
Reference: Mac startup key combinations
par Dan