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‎05-16-2023 06:29 PM

HP Recommended
Product: HP ZBook 15 G3 Mobile Workstation

Our HP ZBook has stopped booting. The power button in upper left corner blinks once per second. We have tested the power supply to make sure it's working by charging a different laptop. We have removed the battery (and retested), checked and reset CMOS, removed one of two memory chips and tested booting with each one separately, removed keyboard and tested with external keyboard, disconnected touch pad and tested with external mouse, and disconnected display and tested with external display. We can't find an explanation for power button blinking once/second.

What else can we try? What does the blink once/second mean?

 

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