I have all in one computer. I turn my computer on and it's completely black the screen. Put power light on. Can you help me

[lpwallen]

My all in one desktop computer screen is black. Computer light on power but cannot see anything

 

[Ralston18]

More information needed:

Make, model all in one? Age, condition, OS?

Any beeps via the speakers? Any error codes or messages on the display?