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SkyGrey
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Laptop hung flashing boot block

HP Recommended
HP Laptop 15-dw0012na
Microsoft Windows 10 (64-bit)

This is more of a record of how I fixed the problem, rather than a question, in case it helps someone else.

 

After starting a bios update, the laptop restarted and hung with the message "Flashing Boot Block" showing progress about 90%. It stayed like that overnight.

 

In the morning I could not switch it off using the power button, so switched off the power cable and let it run out of battery.

 

Later I plugged it back in, and tried turning it on. I heard the fan spin up briefly twice with a black screen, and on the third attempt it got as far as showing the HP logo with the spinning dots, but turned itself off. I think this might have been it trying to automatically restore the bios as mentioned here.

 

After that I did not do a hard reset as suggested here, but instead I reset the bios to its defaults as documented here. Firstly, though I disconnected all devices from ports (usb dongles, hdmi etc) in case that confused things.

 

With all the ports clear, I held down ESC while powering on, and selected F10 to get into the Bios Setup. My Bios screens were a bit different than described in the article, so what I did to reset the bios was:

  • On the Exit page, select "Load Setup Defaults"
  • On the Exit page, select "Save Changes and Exit"

The laptop restarted and got to the Windows logon screen. It was ok from there, but I did another restart to make sure.

 

I would have replied to this post because it was asking about what to do when the power button did not work, but it seemed to be closed.

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