DELL Latitude E5420 Startup error

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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?