DELL Latitude E5420 Startup error

ooommii Posts 1 Registration date Wednesday November 20, 2013 Status Member Last seen November 20, 2013 - Nov 20, 2013 at 10:35 AM
Hello Everyone

I open my laptop to change its cell, now it is not even starting up. Just Blink Power Button and Then goes off, even there is no display.........Any help, please?