Screen resolution gone poor in Mac Mini

I cannot get optimum resolution on my Mac Mini. Just a day before I disconnected all the cords, including power and HDMI, just to move my Mac Mini (OS X 10.9.4) to a different room, and connected it back as it was. (Really speaking only two cords) and now I can't seem to get my screen resolution back.
The earlier screen resolution was there since I connected my Mac Mini for the first time to the LCD TV screen and I never had to deal with any resolution settings, but I am clueless now why I can't SET and SAVE optimum screen resolution settings. Here is screen capture for my System Preferences -> Display settings
I also have DISPLAYMENU app which gets me to a better screen resolution now, but it seems I do not have any option to save that configuration so every time I restart my Mac Mini, the display will go back to its weird screen resolution state and I have to start from all over again to get it back in a good viewable screen resolution with the help of DISPLAYMENU. I have contacted Apple Support and have done resetting SMC and PRAM and entering in to SAFE-BOOT as well; nothing seems to help here. Any other suggestions? (I cannot accept that it is LCD TV problem because 1. Earlier it was working absolutely FINE. 2. I have my xbox connected to same LCD TV and I am getting screen resolution what I was getting earlier.)

Backlight
Direct LED
Refresh Rate
60Hz
Resolution
720p
Dynamic Contrast Ratio
100,000:1
Display Aspect Ratio
16:9
Display Resolution
1366x768
Colors:
16.7 million
This is what I found on manufacturer's website for the TV model I have. I do not remember exactly what was the resolution earlier but it was definitely not 720 (in earlier image). All I know is I can observe the difference in the screen resolution.
Also I have tried all sort of setting and resettings; (I was on chat with Apple support over an about 45 mins and on phone call around the same time.)
Also, I cannot accept that I might be using wrong connectors/adapters/TV not compatible to the resolution I am trying to get to; because it was working absolutely fine just few days before and as mentioned I have connected my xbox to the same TV, which works absolutely fine.

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Screen resolution gone poor in Mac Mini

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