The fuse that is described in the owner's manual is usually the house fuse or house circuit breaker for the electrical outlet that the refrigerator is plugged into. Since the lights are on, that troubleshooting tip will probably not help you. You could have a control board in the refrigerator that is locked up. You can try to reset the control board (if you model has one) by unplugging the refrigerator for 5 minutes. Plug it back in and see if it begins cooling properly.
You indicated that the fans are running. I recommend that you check to see whether the compressor is running. If that compressor is running but you are not getting any cooling in the refrigerator or freezer then you apparently have a sealed system failure. That type of failure will need to be repaired by a service technician since it will require the recovery and recharge of refrigerant (Freon). Here is a link for the Sears Service website:
Sears Home Services
If the compressor is not running, you could have a problem with the start relay or you could have a locked up compressor. A wiring failure or a problem with the control could also prevent the compressor from running.
These initial general tips may help you with that cooling problem in your refrigerator. If you need more assistance, reply with additional details and the full model number of your refrigerator.