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Marlin/src/lcd/ultralcd.cpp

     if (sd_status != lcd_sd_status && lcd_detected()) {
 
       if (sd_status) {
+        safe_delay(1000); // some boards need a delay or the LCD won't show the new status
         card.initsd();
         if (lcd_sd_status != 2) LCD_MESSAGEPGM(MSG_SD_INSERTED);
       }