My laptop keeps blinking [Closed]

Registration date
Monday March 16, 2015
Last seen
March 16, 2015
hi :( i badly need help guys. ive been with these problem for almost half a year.
its about my Samsung laptop. every time ill turn it on, it will start blinking. my OS was windows 8 before but i changed it now to windows 7 for some reasons. i dont know if this was one of the reasons :( also i noticed that there is a weird sound every time i turn my laptop on, but if i will connect it to a charger or let me say if i will charge it, then the blinking will stop, but the sound remains :( :( please guys, i really need your help :) thank you