Answering your question about 8 beeps, it indicates LCD failure in Dell Inspiron N5010 Laptop. It means there is some problem with the Laptop Screen.
I have added you as a friend. Please accept my friend request. I am sending you a private message as well. Respond to the message and provide the system's Service Tag so I may access your system records and check for further course of action.
Note: In case of expired warranty scenario, I would be able to provide limited support, which will not cover part replacement, software support and onsite technician.
MUHAMMAD WAQAS, in order to answer your question I would need a little clarification. Please reply if your question means, your computer was shut down automatically after you left it for 12 minutes unused in the night and it won't power on now.
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