That would typically mean the hard drive has failed. The fact that it did "suddenly it’s just cut out and came up with a black error screen saying “boot device not found"
that is troubling.
Try running the Diagnostics routine to see if anything else reports
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.
I'm not an HP employee.
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