That typically is the result of a failed hard drive.
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. Depending on the results, there are more steps to solving this.
I'm not an HP employee.
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