First place to look for it : samsung.com
Look for Support or Download.
Next, you can search on manualslib.com, manualshelf.com, manualscat.com, all-guides.com, lastmanuals.com or manualzz.com
Those sites contains all sort of manuals, even those that the original maker no longer have available.
And, as N told you, enter the brand and model of your laptop into your favourite search engine and you'll surely find it.
Electro
December 2017
SAMSUNG NP350E7C USER MANUAL Pdf Download. - ManualsLib just type that into google and you will see your manual
n
December 2017
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix notebooks/laptop pcs.