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Laptop won't boot

Elitebook 820 G3
Microsoft Windows 10 (64-bit)

My laptop won't boot suddendly. I left it unused overnight and the next time I pressed the power button, the laptop only flashes its screen and every led on the machine periodically. I receive no error messages.


The blinking is constant, and the laptop will blink forever if I don't power it off.

I have tried pressing and holding win+b and win+v to no results. I have tried booting with no hard drive connected, still no result.


What happened to my computer? Please help.



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