@Shunter101: As taming said, it could be books on the card that can't be processed properly. But, it might be how many books you have on the card.
Try taking the card out, restarting and seeing how long it takes. If it still takes 12 minutes, it is a problem with the device.
If it starts quickly, put the card in and see how long it takes to process the card. There are two steps in this. Firstly it sees the card and checks the state of the books against the internal database. Then it displays the black processing screen while adding new books to the database. The question is how long do each of these take? And, does the processing screen display at all.
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