My mom is trying to extend her monitors and all that comes up is the background, any solution?
Your question is a little inaccurate, but I guess she's trying to extend her Windows desktop over two monitors placed side by side. In that case it's normal that the second monitor only shows the desktop background. Try sliding the mouse of the screen of the main monitor, and it should show up on the second monitor.
If you use windows Vista/7, press Windows-key + P to see several options (only monitor 1-duplicate-extended-only monitor 2). Enter Screen Resolution (right-click on your desktop or enter control panel) to change the resolution and position of your second monitor.