I've been reserching this till my eyes hurt.
Yes the power jack is ok, the machine works normally with a full battery but cannot see the charger.
This is a motherboard problem so I got another one, it also has this problem as do hundreds of others.
So my search continues to see who has finally solved this.
I have tried everything I could think of, extensive resoldering, mag switch under cover, new DC jack, second battery, second mainboard, jumpers to video jack, extra grounding, suplement battery charging, I'm obsessing with these Dells.
FYI this is not just the 1150 but other models as well.
It really looks like a planned obsolesence, as all battery problems seem to be.
Any suggested options are appreciated, It can't hurt now.