How have to formatted the sd card? If you are just using the inbuilt windows formatter that probably won't do it. You may need to use the sd association software https://www.sdcard.org/downloads/formatter_4/
If the extruder heats up then it can definitely read something from the card.Please use the USB connection and check the exact temperature it reaches. If it can not reach the defined start temp, it won't start.
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