How to install an operating system on my HP pavilion without a hard disk

[BrandiBa]

I keep getting an error message that says Boot  device not found please install operating system on your hard disk. It will not let me passed this screen. How do I fix this?

[TheOldMan]

Keep in mind for a computer to work it must have some type of media to hold the OS and then load the OS.

If there is no hard disk then it might have a SSD either of the conventional type or a M.2.

If neither of them are present, then perhaps a media card or DVD/CD.

That error typically means the disk is failing, but it can also be caused by something interfering with the boot process.

To verify that, run the Diagnostics routine.

To run the Diagnostics routine, Start tapping the Esc key BEFORE starting the PC and then press the start button.
Keep tapping the Esc key until a popup menu shows. Then pick Diagnostics from that popup menu, F2.
Report back with the results. Also need the PC model number.