Refrig not cooling
Either the fan that blows cold air from the freezer compartment to the fresh food compartment is burned out or the door/flap that seperates the compartments is stuck or the linkage connecting it to the fresh food temperature dial is stuck or broken.
The evaporator coils are in the freezer compartment and air is blown from the freezer compartment to cool the fresh food compartment. For some reason, air is not moving to fresh food compartment.
If the fan is running, it could be something as simple as Ice blocking to door between the freezer and fresh food compartment. I know modern refrigerators are self-defrosting, but that's only the evaporator coils, which are defrosted by a timer and a heater.
Ice can form on passageways inside the refrigerator, like the exit of the ice maker and in this case, on the door and 'tunnel' between the freezer and fresh food compartment. It's free, and doesn't take a lot of time, so try completely defrosting the unit before doing anything else.
BE SURE to keep the doors open, as odors can form as particles of food are allowed to defrost that may have been frozen in an ice pack for months or even years. Clean the interior of the refrigerator while you have everything out and reset the controls to normal settings.
If this doesn't help, there may be a mechanical problem with the air transfer control flap/door that will need to be fixed.
Hope this helps.