Hi Edward Thompson,
Since your desktop icons remain visible when the background turns black, I’d suggest checking whether desktop background images are being disabled through Windows accessibility settings.
- Open Control Panel > Ease of Access > Ease of Access Center.
- Select Make the computer easier to see.
- Look for Remove background images (where available).
- If it is checked, clear the checkbox and select Apply > OK.
- Then restart the PC and check whether the wallpaper remains visible.
If that option is already unchecked, please let us know whether the background turns black after a consistent amount of time or after a particular action. That can help narrow down what is changing the background.