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hp elitebook 840 g5 no power

HP Recommended
Microsoft Windows 10 (64-bit)

My laptop (hp elitebook 840 g5) was working fine until it didn't. When I plug my power supply into the laptop the charging light comes on for about 5 seconds then goes out. Also when I plug it in the keyboard backlight flashes on for a second and goes out right away.

Is this a power supply issue? Battery? or Motherboard? or anything else?

Thanks for any help.

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