08-19-2016 12:21 PM
I have a ProBook 640 G1 that will not power on.
After pressing the power button, with a battery installed and the AC adapter attached, the Charging LED blinks white 9 times . Unplugging the AC adapter results in 9 amber blinks. The light on the AC Adapter itself remains solid green.
With the battery removed, and attached to the AC Adapter, three lights blink continously : The light on the power button (white), the Charging LED (AMBER), and the Power LED (White). The light on the AC Adapter itself remain solid green.
In both cases pressing or pressing and holding the power button has no effect. There is no indication that power is actually making in to the MB; no BIOS , nothing at all.
I do not have access to another unit with the same battery or AC adapter in order to try swapping those out.
07-09-2017 11:34 AM