Wy is it when i turn m puter on the back ground is black?

Question:

Answers:
Does it stay black? Add a background. Does it just start black and then load your background color/picture? That is your computer before it loads any programs. The operating system of your computer is DOS based, and is text only. No pretty colors or pictures, just a black screen and lines of text.
Right click on your desktop and follow the links to add/change background, or poke around in the control panel to find it.