I had the same problem with my Nintendo Switch. Try this remove the ribbon cable from the game card slot that is connected on the left hand side. Next grab some rubbing alcohol and clean the ribbon cable and the pins with the alcohol. (Careful not to use too much of the alcohol as you might get the LCD screen or other components burnt). Last reconnect the ribbon cable back into the slot and turn on the system. This is what I did to my switch not 100% sure if it will work with all Switch's.