why cant i take photos in M or A mode

[philsolihull]

Sorry if I sound daft, I have a D7500, and I'm new to the game. Just playing at the moment
When I use all other modes, i get an image
if i turn the selector to M or A i get nothing but blackness on the image

 

[Clovishound]

What settings are you using? If you have your aperture very small, say F22 or F32, it will allow very little light through to the sensor. Try setting your camera to M and set it to F8 and 1/500 sec with an ISO of 100 and try a test shot in bright sunlight.

 

[Needa]

Don't know your familiarity with manual and aperture modes but maybe look at some videos like the one

 

[BF Hammer]

Please share which lens you are using. Not every vintage lens can have the aperture controlled by the camera body.