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HP ProBook 450 G8: Power Indicator flashes orange and white + device won't start

HP Recommended
HP ProBook 450 G8
Microsoft Windows 10 (64-bit)

We have two HP ProBook 450 G8 devices that came back to us.

Both devices won't start and after removing the batteries (both internal as CMOS) the Power LED next to the Power Supply flashes orange and white, but that's all it does.

Any advise?

Is the motherboard fried?

or ... ?

Kr, 

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