New Mac Air and HP monitor.  The monitor only displays the background.  How Can I get both to display the same thing?

I have a new Mac Air and want to use my HP Monitor HPLP2475w to save $$.  I attached it to the Mac Air but all I get is the background of my laptop.  How do I get this to match or use in the dual mode.
Thanks,

Hi Jackie,
Welcome to the Support Communities!  How did you attach the Macbook Air to your HP Monitor?  What cable did you use?  The article below will explain how to setup the display.  Video Mirroring is the option that will allow you to see your computer's display on your HP.
OS X Yosemite: Connect a display
http://support.apple.com/kb/PH19035?viewlocale=en_US
You can easily view the contents of your Mac on a display, like an Apple Thunderbolt Display, or on your TV.
Connect an Apple Thunderbolt Display: 
Plug the display’s cable directly into the Thunderbolt port  on your Mac. 
Connect an Apple LED Cinema Display: 
Plug the display’s cable directly into the Thunderbolt port  on your Mac. 
Connect a TV or display with an HDMI connector: 
Plug the cable directly into the HDMI port on your Mac. For more information about using a TV, see Use your TV as a display. 
Connect a display with a VGA connector: 
Use a Mini DisplayPort to VGA Adapter to connect the display to the Thunderbolt port  on your Mac. 
Connect a display with a Mini DisplayPort: 
Plug the display’s cable directly into the Mini Display port  on your Mac. 
After you connect your Mac, the contents of your screen automatically appear on the display or TV. 
If your display uses a video port that’s not available on your Mac, you may be able to use an adapter to connect your display. For example, If your Mac doesn’t include an HDMI port, you can use a Mini DisplayPort to HDMI video adapter with the Thunderbolt port on your Mac.
OS X Yosemite: Connect multiple displays to your Mac
http://support.apple.com/kb/PH19039
Set up the displays for video mirroring
Video mirroring shows the entire desktop on each connected display.
Choose Apple menu > System Preferences, click Displays, then click Display.
Set both displays to the same resolution.
Click Arrangement, then select Mirror Displays.
Enjoy your new Mac!
- Judy

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