SMPS FAN NOT ROTATING (psu not working) WHEN CONNECTING TO MY MOTHERBOARD

May 15, 2018
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I am building my first gaming rig. So I’m a beginner,
. I have this annoying problem where I connect the 24 pin and cpu connector of the power supply to the motherboard but the fan doesn’t rotate. I have a thermaltake litepower 450 watt smps. I have a msi pro vdh b350m motherboard.Before I bought the smps, I asked the technician to check if it works and it did(the fan rotated). To make mysels sure I also did the paper clip test and it worksed again. I saw it a problem with the motherboard? can you guys help me out here? I have everything ready just need to connect the psu connectors. PLS HELP!