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Why did my laptop not start yesterday (please read)?

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so yesterday mornin i tried opening my laptop and it got to point where i have to sign my user password but all i could see there was my mouse cursor and complete darkness. nothing worked couldn't even open the task manager. restarted the laptop couple of times but still the same prob. then came back frm work and did a system restore and now it seems to be all good. any one have any idea why my laptop did this and will it happen again?