Whilst using my laptop it powered off unexpectedly and won't come back on. Ive tried connecting it to the powere adaptor but it's not charging Nd is still off. Battery was fully charged before it went off

Whilst using my laptop it powered off unexpectedly and won't come back on. Ive tried connecting it to the powere adaptor but it's not charging Nd is still off. Battery was fully charged before it went off. Please what can I do?

Try resetting the  SMC http://support.apple.com/kb/ht3964
Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379

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