It would be helpful to have more details and the model number of the PC. Run the diagnostic routine and report back with details, everything passed is not always helpful. The hard drive details are important. Also disconnect unneeded external devices. This sounds like a hard drive failure but it could be something else, too.
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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