Refrigerator stopped cooling. Since this morning, my Kenmore Elite ColdSpot refrigerator (Model #

Question

Since this morning, my Kenmore Elite ColdSpot refrigerator (Model # 106.53606202) has stopped cooling (both freezer and main compartment). Here is what I am noticing:
* It is getting power since the lights are on.
* The fan in freezer is blowing air but it is not cold enough.
* Nothing inside the freezer or in the rear have frosted.
* The compressor fan in the rear is working.
* Water is coming properly from the dispenser.
* I do sometimes hear clicking sound from the back of the refrigerator.
Someone suggested that this could be because of a bad relay switch. Someone else suggested that the whole compressor might have gone bad. Anyone way to know for sure what the problem is? Is there anything else that could be wrong?
Thanks,
Madhuvan.