|Dell has some of the worst tech's. |
If Dell has tested the AC adapter then I assume there is an issue with the wall jack. Try another wall jack. Be very very careful. if there is some damage to the wall jack your life may be in danger from fire or electrocution. If another wall jack works properly, contact an electrician immediately to have the wall jack inspected. .
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.