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Question Laptop shutdown

Mar 16, 2020
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Hey i have a HP ProBook 6470b
Today when I tried to turn it on I have black screen and after 5 seconds turn off auto
I tried to start without battery only eith AC but nothing
Take out the HDD and ram and puy it back but still nothing
I search in forums for something but nothing .. Help me please :) I have to do projects for university when we study from home