I found a local work from home tech who did replace the part I posted earlier, and it worked.
It WAS NOT the power cord, it was the jack. It's working great, he charged me $40, which is way better than the probable $200.
He had seen the issue before and is of the opinion on this model of Dell the jack area was not designed to be strong enough. I did get 4 years out of it, but whatever.
So there may indeed be some power cord issues out there, but the jack is an easy fix and should be looked at once you sort out the power cord issue.
FWIW.
Resolved.