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HP Elitebook 840G2 dark screen LED Code

HP Recommended
Elitebook 840 G2

My Elitebook 840 G2 has a black screen and does not boot.

The LED of the

power button blinking amber

WLAN amber

Speaker amber

num amber

All LED's are blinking together for 1 second and are 6 seconds dark.

 

Any ideas?

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