There could be several reasons why your Samsung fridge not cold. Here are a few potential causes and troubleshooting steps you can try:

1. Check the power supply: Ensure that the fridge is properly plugged in and receiving power. Check the circuit breaker or fuse box to make sure there isn’t a tripped breaker or blown fuse.

2. Temperature settings: Verify that the temperature settings on the fridge are set correctly. Usually, there is a dial or digital display that allows you to adjust the desired temperature. Make sure it is set to a cooler temperature.

3. Door seal: Inspect the door seal/gasket for any signs of wear or damage. A damaged seal can cause cool air to escape and prevent the fridge from cooling properly.