This may be redundant, but I'll ask again: I want to connect my mid-2010 iMac to mirror on my TV. I can't connect via Apple TV due to the year of my model. The iMac isn't near the TV. I bought the MiniDisplayPort to HDMI adaptor and a 20 ft HDMI cable. I connected the MiniPort to the back of the iMac, connected the adaptor to the HDMI cable and the cable to one of the HDMI inputs on the TV. I checked the "Displays" settings under "Hardware" and made sure the box is checked that will show mirror options in the menu bar when available; however, nothing shows up. Apple Tech Support stated upgrading to Mountain Lion is not feasible for my year model. Any troubleshooting assistance is appreciated.