Turn off your device and remove all power cords from it. If on desktop, remove any residual power by pressing the power button for at least 10 seconds. Now, carefully remove the side panel to get access to the internals of the computer. Check for any disconnected, misaligned or damaged wires. HP Notebook and Desktop PCs - Computer Stops Responding (Hangs) During BIOS Update When in Legacy Mode Notice: The information in this document, including products and software versions, is current as of the release date.The document is subject to change without notice. Selected boot image did not authenticate. Please press enter to attempt to boot to next device. Naturally, we figured secure boot was on, and we would disable it. Under the Advanced menu, we went to the secure boot option and chose Legacy Support Enable and Secure Boot Disable . As this seemed to be the only option to change, we saved our While the notebook is off, press and hold the Windows + b key press combination. While still pressing the Windows + b key press combination, press the power button for one second, and then release the keys. The power light remains on, and the screen remains blank for about 40 seconds. You might hear beeping sounds.

HDD is visible, but not USB. If the HDD option is visible at Boot Menu, but not the USB drive, follow these tips and reboot your computer to try again: If your computer has multiple USB ports: plug and unplug the flash drive in different ports for each boot you do; If your computer has USB 2.0 and USB 3.0 ports: try to use the flash drive only

So you want to change the BIOS to Legacy, you change it to Legacy as you have stated above, and it still has the Secure boot option,. My BIOS cannot be Legacy, but it does have Legacy Suport. BIOS was discontinued with Windows 8 when UEFI came in. Some UEFI systems have Legacy Support that pretends to be a BIOS. . 520 673 765 202 475 51 391 632

hp laptop legacy boot option not showing