Q: Can't view computer video on TV. Only my desktop picture

Hi denafrommarlton,

From your description, it sounds like you currently have your external display (TV) set up as an Extended Desktop. If you would like for it to show the same thing you are currently seeing on the internal display, you would want to set it for Display Mirroring. You may find the following article about the various display modes in OS X helpful:

OS X: Using multiple displays in Mavericks - Apple Support

Regards,

- Brenden