The computer is new to me, it was working perfectly the day before I received it from a friend. I set it up, plugged it in and turned it on. The screen remains blank. I know the computer is running because Cortana starts talking to me about picking a region. I have done the reset where I unplug the computer and press the power button for 15 to 20 seconds 3 times.
The only other device I have is my android tablet. I don't have another monitor to plug into. I went to HP support and I can't do the diagnic program because I can't use the screen. The AI assistant gave me the same advice about unplugging and pressing the start button and then inevitably forgot I had a desk top computer and starte


