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HP EliteBook 840 G4 Notebook PC

My notebook fails to boot sometimes. When it happens the screen remains dark while the power, Wi-Fi, mute and all the other keyboard buttons keep blinking every 4 seconds. Sometimes it boots up but after a while it freezes. Sometimes it works fine. How can I fix this? A friend told me to update the BIOS or reinstall the operating system. Is that the solution?

  • I recorded a video of it. Here is the link: [content removed]
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