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L'HP EliteBook 840 G2 est un ordinateur portable avec un écran 14 pouces commercialisé le 2 décembre 2014.

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Won't power on, power and caps lock flash continuously

Computer won’t power on. When the AC adapter is plugged in, the power and caps lock lights flash white continuously, no pattern, just fast blinking. I have cleaned ram, switched slots, taken cmos battery out to wipe cmos. I have removed the battery and tried with just ac, yet nothing. Can anyone help me out?

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Here is HP's codes and solutions:

What light pattern or beeps with just the battery?


@aactech Thanks, but as I stated before, there is no pattern. I looked at those before posting my question and I couldn't find anything that helped. When the computer is plugged in, the lights come on and flash quickly and evenly with no pattern or changes. There are no short flashes, or pauses at all.


The computer was knocked off a table while plugged in. originally it was thought that the power adapter was damaged, but I can trace voltage through the adaptor on the motherboard. It also ran off battery power afterwards without a problem until the battery died.


Did u got the solution , if yes please share with me i h same problem


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This is most likely a corrupted/damaged BIOS. I have had this happen to one of the machines at the office where I work, processed a BIOS update that botched and would only flash white, no pattern.

I had to make a BIOS recovery flash drive. You can find the downloader for the BIOS update for that at HP's support site for your model (The Elitebook 840 G2 drivers and downloads site is here). If you run the installer on a different Windows machine, it should give you the option to create a recovery drive for another device. I often get an error with these where it cannot save to the required folder because it doesn't exist or something to that effect. You just need to create that folder in the root directory on the flash drive.

Once the recovery drive is created, plug it into the device that needs recovery and then power it on. Theoretically it should recognize the BIOS update file and process the update.

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Mike Stettler sera éternellement reconnaissant.
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