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Hp Probook 450 G6, no power, flashing lights

HP Recommended
Microsoft Windows 10 (64-bit)

No power at all without AC adapter. With AC adapter; power led: fast flash once (white), CapsLock: slow flash once (white), Battery led: slow flash once (white) AND 4 times fast flash (amber), both at the same time. Anyone any idea what does that mean? Can't find any explanation out of web. 😫

Tried another AC adapter but the result is the same. Also disconnecting the battery didn't change anything.

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