Bootup failure on Pavilion 15

[Gemnuts]

We have recently had a boot up problem in that when we power up our laptop, the screen remain black and nothing loads.

Initially, the power and network light lit up and the Cap Lock key flashed intermittently.  On researching, this appears to be a BIOS error.  I have completed a hard set by removing the battery, holding the power key and then connecting to the AC cable. Also tried a The BIOS option of holding the Windows and B keys before powering on.  The first time I did this, it beeped as expected and then nothing happened stater some time.

I have tried again today and the CAP lock key now not lighting up or flashing but I continue to hear the hard drive start and fan spin, but still nothing happening in terms of loading or screen coming on. The network/wireless key remain Orange the whole time 😬

any suggestions?

[Lil_Boy_Blue]

Hi
First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

AND/OR - Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).

 A little light reading...

https://support.hp.com/us-en/document/c02693833

Turn off the computer, and then connect the power cord.
Press and hold the Windows key and the B key at the same time, and then press and hold the power button for 2 to 3 seconds.
Release the Power button but continue pressing the Windows and B keys. You might hear a series of beeps.
The HP BIOS Update screen displays and the recovery begins automatically. Follow any on-screen prompts to continue the startup to complete the recovery.
HP BIOS Update recovery in progress

If the HP BIOS Update screen does not display, repeat the previous steps but press the Windows key and the V key. If the screen still does not display, your computer might not support the feature or there is a hard drive issue. Continue to the next step to install a BIOS recovery file from the HP website.
If the Power light turns off, the Power button was held too long. Repeat the previous steps, making sure to hold the button for only 2 to 3 seconds.

https://support.hp.com/us-en/document/bph07107

If in doubt please ask.