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‎01-07-2022 04:04 AM - last edited on ‎01-07-2022 11:19 AM by Retired

HP Recommended
Product: HP EliteBook 820G4
Operating System: Microsoft Windows 10 (64-bit)

Hello Community!

 

My symptoms:

1. I've turned on my EliteBook 820 G4. It was only a black screen and a cooler sound (at high speed). No response to mouse/keyboard.

2. After about one minute I've decided to turn it off by pressing power button for a few seconds. The laptop has turned off.

3. The next turn on - black screen, and the only reaction is a cyclic blinking backlight of the keyboard and status leds in some repetitive manner: [content removed] 

4. Any next power-off- power on - going back to point 3

 

to break the cycle:

 

5. I've removed a battery for about 5 minutes, then put it back, then plug in the power cord for 15 minutes

6. After pressing the power button, the cycle has started from point 1 and ended in point 3

 

Any ideas?

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