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I standby for 8 hour and shutdown. Can't open why?
Sorry for my english.
Your Pi won't start because the boot sequence is unable to mount your root file system. This might be due to a misconfiguration or possibly a corrupt SD-card.
I would lean more towards the SD Card being corrupt in this case. If it was an issue with the actual OS I would have suspected more of a clear indication that no OS or something found or more direction in terms of error message.
Required, but never shown