Dell XPS L502X Black screen and now LED not blinking

Hi,

I have a Dell XPS L502X laptop. It was working fine until one day it had trouble booting. When I turned on the laptop it was stuck with black screen and not moving forward. I read in dell forums, I read the following solutions,

1. Remove power and battery and press the power button for 30 seconds (Didnt work)

2. Possible RAM failure. I opened the back panel and tried just having one of either RAMs (Didnt work)

I then turned off my computer. The next day the computer wont even show a black screen. It looks dead. When I plug in my power cord, the power LED wont light too. I can smell a very little burnt smell. Not sure what happened here. 

Can someone please advice me regarding this. 

Regards,

Karthik