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- Desktop Operating Systems and Recovery
- Boot Device Not Found (3F0)

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04-10-2020 03:22 PM
Given the date of your post, I would have expected someone to respond to it before this -- but since that has not happened, I will take a shot at it ...
That error message normally means that your hard drive has failed or is failing.
If your PC is new enough to support UEFI, you can use these steps to test the hard drive: http://support.hp.com/us-en/document/c00439024
If not, to check the drive you have to follow these steps:
1) Press Esc key repeatedly, several times a second, while rebooting the laptop. Do NOT hold the key down, just press it over and over.
2) Eventually, you will see an HP Startup Menu -- that will look similar to the image below
3) press the Function key for testing the hard drive (usually F2) and let it run.
I am a volunteer and I do not work for, nor represent, HP