There are several ways to change your video input source for the E421VO. First: the lowest button on the side of the TV will cycle through the inputs. (The power button is the top button.) The original remote has the Input button to the left of the Zero button at the bottom left of the number area. With both just press the key multiple times to go through all of the inputs. Alternatively, press the Menu button and look for the Source sub-menu. Use the arrow keys to move to the chosen menu. (On the TV, the menu button is below the power button. On the remote, Menu is the button to the top right above the arrow keys.) If you are using a universal remote, you may need to find one that matches the Input or Menu functions for your TV. A different code may help if the remote has either button. Otherwise, you'll need a different remote.
The manual for the Vizio E421VO is available from Vizio's product site: http://www.vizio.com/e421vo.html . Click on the Support/Manuals tab. The direct link to the manual is http://www.vizio.com/documents/downloads/hdtv/E421VO/UM_E421VO.pdf . All of these options are shown in the manual.
I hope this helps.
Cindy Wells
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