Some refrigerators have a "reset or trip switch" that is not marked or indicated in any way. This video is just an example of what you might want to look for if you are plugged in but not cooling. My owner's manual DID NOT show anything about this switch, I just stumbled on it by chance. The refrigerator was less than a year old when I had to un-plug it & it would not come back on. Good Luck.
