HP ZD70000

This laptop is in the same family of the ZV/ZX laptops and has the same dc jack issues. I haven't done one in a couple of weeks which is rare.
It came in with battery life left which is really nice for testing purposes. He bought the three year hp warranty and has had the board replaced five times! He was very informed about the jack issue and brought it in right away because his warranty had just expired. I always recommend a three year warranty with a laptop purchase. You just might buy one with this common problem.
The laptop charge light would come on when plugged in but as soon as I would try to turn it on the light would go off and the laptop wouldn't power on without the battery in. Not really a dc jack symptom but we went for it anyway.
Once the laptop was all torn down it had the classic burnt voltage pin on the back which was slightly burnt. I replaced the jack with a new one and laptop charged fine again.