Hi @jimmysofat6864 ,
Have you tried altering the resolution (frequency) of the display in the computer?
If set to 60Hz (maybe shown as 59.xxxHz) try a lower frequency (if possible).
If Win 10 is the OS go to Settings > System > Display > Advanced display settings > refresh rate
Presumably you tried using the TV control buttons as well? Go to Menu > Picture > Advanced video setting > Aspect ratio as well as trying this when using a different input type, coax, Composite video etc?
The only things that I suggest now is to either try a different HDMI cable if you haven't already done so, just to eliminate it as the possible problem or try resetting the TV back to its default settings and see if this re-enables the aspect ratio function. Go to Menu > Settings > reset to default.
If still no good then there may be a problem with the firmware or the HDMI controller in the TV. You could try contacting Coby and ask their technical support why the aspect ration function is not working if it only affects the HDMI input.
Alternatively if you do want to use it with the laptop, try connecting the laptop to the TV's Component video/audio inputs via a converter (supplier example only) and check if that works OK
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