Helpful info on resetting Bios on HP laptops.

[Porthos]

Had a HP laptop that would not boot even to bios after messing with secure boot.

Recovering the notebook BIOS using a key press combination
When you upgrade the BIOS on your notebook, a copy of the previous BIOS version is stored in the HP TOOLS partition of your hard drive. Many HP notebook computers have an emergency BIOS recovery feature that allows you to recover and install the last known good version of the BIOS from the hard drive, as long as the hard drive remains functional. This emergency recovery feature is separate from the BIOS and is designed to work in the event of a catastrophic BIOS failure.
You can use these steps even though you will not be able to see anything on the monitor.
To recover an earlier version of the BIOS on your notebook:

1. Turn off the computer.
2. Plug the notebook into power using the power adapter.
3. Press and hold the Windows key and the B key at the same time while the computer is off.
4. While still pressing the Windows key and the Bkey, hold down the Power button on the notebook for one second, and then release the Power button and the keys .
   The Power LED light remains on, and the screen remains blank for about 40 seconds. You might hear beeping sounds. Eventually, an HP BIOS Update screen displays and the BIOS update begins automatically.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03518165&lc=en&cc=us&dlc=en&product=6761854

 

[mr m]

Thanks for that.