My laptop won't show display

Hello,

i have TOSHIBA Laptop
Family Satellite
A300
Model no: PSAG4E
some day before when i turn on my laptop it did not start at first attempt. means when i turn on my laptop it restart abnormal automaticaly. i think this is beacause my RAM are not working properly so i purchased new RAM and plug it into laptop but after then my laptop won't show display..........

please please help me... naumnkhalid88@hotmail.com is my id please help mei out... i will be thankful to you....