LED Off on AC Adapter - Won't Charge

I add the same problem. It turn out the connection inside the adaptor to the lower voltage side is very prone to short circuit. I broke open the adaptor no screw, probably snaps or glue, and I cut the plastic protector of the low voltage wire. Inside, there where signs of short circuit. A bit of electric tape, and I work like new, like I said, it is not as pretty as is was, but it work.

ok ihave the same problem with my latittude computer sometimes is recognized sometimes is not well i went into bios and i found something very interesting .it says like this, if you are using an ac adapter with a lower it will ,display the warning in fact im using the lower watt ac adapter so im going to upgrade to the higher wattage cord which i think is 90watt and the one i have nowis 65watt idon,t which one you all have but it would,nt hurt to try if you havent

The dell power connector is held in place by narrow flanges. It is easy to break one side or both and this causes the power connector to move enough to sometimes connect and frequently stop connecting. If the laptop is in warranty, contact Dell tech support. If it is out of warranty, find a take apart instruction that matches your laptop and check to see if the power connector is loose in the case.

Another thing that sometimes happens is the power connector gets damaged when the power cable is pulled out at an angle. There should be a black plastic insulator in the middle of the power connector, the insulator protects the inner contact from shorting out on the barrel of the power cable. The power connector is different from each model, although the pin out is the same; so be careful which power connector you get.