Hi @Rebecca_01
Welcome to the HP Support Community !
You posted 2 days ago. If you still face this issue and if it hasn't progressed, you have no other option other than turning the notebook off. Press and hold the power-on button for 5-10 seconds until the computer powers off completely.
Wait for a while and press the power-on button once to start it back. Let's wait and see what happens.
If the computer fails to start eventually without any progress, the BIOS update may have failed to complete successfully. You will need to attempt recovery and follow the steps from this article >> https://support.hp.com/us-en/document/c02693833
Let me know how it goes
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