Chances are, the phone is totally ruined and there is simply an image burned into the lcd. you can always try soaking the phone in distilled water (to cleanse it of impurities) and then baking it in the oven on the lowest setting to see if it works...
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Probably its battery problem but before change the battery you have confirm first its battery or Adopter problem. you need do first check the adopter to another laptop which has same charging pin . if its doesn't work with another laptop then you change the adopter but if the charger works with other laptop then you need to change your battery. try it..
So put the old power cord back on since you say it charged the battery normally. Why did you change it if it was charging the battery? It's quite possible that the new power cord is faulty. Just because it is new does not mean it works.
Remove the battery and plug the new power cord in. Does it boot the laptop up? Are you able to function with the new power cord plugged in. If so, then your battery is more than likely dead and needs to be replaced. The battery only has a useful life and once it is completely bad it will not charge.
Try changing out the battery with a new one and see if it charges since the power supply is working because its charging. If a new battery doesn't work then the motherboard is bad and would need to be replaced.
Sounds like you should try a regular Dell factory refurbished battery. Or if not that, try a battery that you knows works for sure. Then try charging it up, if it doesn't charge up then you know its a situation with the motherboard.