My 6.5 year old maytag plus refrigerator is not cold. I do not even hear the motor. What could the problem be?

I have a Maytag Plus refrigerator. It is about 6 years old. It was fine last night but today we noticed it was not very cold inside. We did not even hear the motor anymore. What could the cause be? Is it an easy consumer fix or will we need to buy another refrigerator?