HP Pavilion 23 will not turn on- can hear fan, power light is on, nothing on screen

HP Pavillin 23 will not turn on/power up???.
When we press the power button:
- can hear fan
-power light on back of computer is lit (where power cord is plugged in)
-power light on top of computer is lit
-but nothing happens with the screen. No light at all, no screen at all; it remains black.
Help please!
Thank you so much!

It is important to know the exact model #, and current OS of this AIO. Just saying 23 is like owning a Chevy.
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