Dell Inspiron n5110 wont turn on

I have Dell n5110 i3 Model, i bought 7month ago. it worked fine but from two to three days it do some problem which is , it urn off automatiically during working, and wont again start. then i took out battery for 10 min and then reinsert it work again. but now it completely turn off. i have 3 month warranty remaining. what solution you give.. will we claim Dell warranty for this problem. ???