<Sigh> Every time I read one of these Factory-Reset-Failed posts I cringe and continue to wonder why everyone seems to think a factory reset is a miracle cure when, in many cases, it only serves to make things worse!
If a factory rest starts out OK and then halts part way through, that is nearly always an indication of a failing drive -- which is a hardware issue that a factory reset will do nothing to fix.
If not, 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 3) press the Function key for testing the hard drive (usually F2) and let it run.
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