Boot device nota found

[Mooren]

I get message "Boot Device not found", "Please install an operating system on your Hard disk", "Hard Disk (3f0)"

After clicking on F10 I cannot go further as I cannot remember the Admin password.

I enter 3 times and the halt code Is [ i 52559872 ]

What can I do to fix this problem?

How can I reset bios to factory default?

[WAWood]

@Mooren 

You're mixing different issues -- none of which we here can solve.

To get into the  BIOS settings, you press the Esc key repeatedly while rebooting and when the HP Startup Menu appears, you select the option for Settings, usually F10.  If you are then asked for a BIOS password, we can not help you with that.

Passwords can NOT be recovered; instead, they have to be reset.

We are not permitted to assist in resetting passwords due to HP Policy.
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For BIOS or power-on password resets, because the password is encoded onto a chip on the motherboard, replacement of that motherboard is required. HP does not reset the BIOS password on the current motherboard.

If you are not prepared to spend the money to get HP to replace the motherboard, you would have to take the PC to a local repair facility to see if they can do it for you -- but we can not assist in that in any way.