Yes, I meant all at once.
Bios is the inner hard disk language which integrated in all hard disks, necessary to receive the operating system.
I don't know where you got this laptop, but I am 100% sure that HP supplies every buyer with a set of Windows' CD's, especially if Windows was installed by HP and HP installs it on all its computers.
If you purchased your laptop second hand, the person who sold it to you must have those disks, they are part of the computer and they are unique because the key.
The only other option is to go on the HP site and purchase a set of recovery disks.
Had we been able to go further, I would have guided you to your laptop's recovery partition, usually in "D", but in this case, we are not getting any reaction from the poor beast.
Just in case, remove the battery and cables. Try to boot.