Laptop stopped working and wont charge


I have a DELL laptop was working fine when suddenly it went off and wont switch on when i tried. i connected the charger as i thought laptop is discharged.
now the laptop is not charging and and the light also turns off of the adapter when connected tp laptop. i have another laptop also of dell...when i connected my another laptop to the same charger, my laptop was charging. please suggest me what to do to switch on the earlier laptop so that it functions properly