Or right click on an open section and select screen resolution (Win 7) The resolution will say something like Landscaped Flipped
It's not the computer, it's the TV. If I invert my display on the computer it will be right side up on the TV.
This is most likely a setting that can only be altered using the TVs service menu. On LG flat screens such an option is named "Mirror" (within a sub menu of the service menu) which can be toggled on or off.
The link below may help you access this menu with the TV's remote otherwise a local retailer may be able to help you out as they would have knowledge of how to access service menus for display purposes .. otherwise an accommodating service agent may also be of help. http/electronicshelponline.blogspot.com.au/2012/06/emerson-sylvania-magnavox-tvs-service.html