Hi, I'm a field service tech with a frustrating problem. HP Probook 640 G1, initial customer complaint was that the system will charge battery when turned OFF and plugged in, but system will not charge battery or use wall power when turned ON.
Battery and power cable were replaced; no change. Conclusion at that point was a problem existed between the power cord and power connector on the system board; thus the system board was replaced.
Since then, the laptop will not power up at all, on battery or when plugged into the wall.
Today I replaced the power button board, and got the same symptoms, but noticed that when I press the power button, the battery indicator LED blinks nine times and stops; nothing else happens.
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Hello, I have run into the same problem problem with the HP Probook 640 G1 not powering on when the power button is depressed and have swapped out battery and power supply, but no joy. What fixed it for you. Please advise.