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So first, the fridge light being out has nothing to do with the refrigerator not cooling. Either your bulb is bad or the light switch is bad---that's not on the same electrical circuit with the cooling components whatsoever. The power comes directly form the cord that powers the entire unit from your house so because the fan inside the freezer is working and the freezer is cooling---you know it's getting power.
As for the refrigerator not cooling, the first thing you'll need to do is pull everything out of the freezer and remove the lower back panel inside the freezer. Look at the silver evaporator coils behind this panel and are they packed with frost, lightly frosted from top to bottom? Also, is the fan above the coils running?
If the fan above the silver coils is not running---replace the fan.
If the coils are completely packed with frost, you have a defrost issue. You'll need to thaw all the frost out with a hair dryer and check the resistance through the defrost heater that runs along the bottom of the silver coils as well as check continuity through the defrost thermostat which is the 1" round device clipped onto the top of the silver coils. If either part DOES NOT have continuity then it needs to be replaced. You'll need a multimeter to test continuity.
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