Done.
I changed the adapter twice... now I have 2 adapters minus the 3rd one which I sent back to Dell.
Changed the battery.
Opened up the whole thing, tested the internal adapter and found out that the pin wasn't connecting properly so I resoldered it. I reassembled it, and the charging light went on but it failed to start up.
Now I reopened it, reassembled it again now the charging light fails to turn on. This laptop stinks.