AC Adapter trouble

First thing to try is a new Dell adapter -- if that doesn't solve the problem, then the mainboard needs repair or replacement.

Post your computer model and OS when asking a question. Check the adapter by removing the battery and trying just the adapter. If it works, the battery needs replacing. If not it could be the adapter or the motherboard.

I have a Studio laptop and last night for the first time, out of the blue, I got the same message as the original post here. It works off the mains when the charger is plugged in, but says the battery isn't charging. We also have an Inspiron laptop and I tried the AC adapter from it but this will not charge the battery either. The little battery icon on the right of the keyboard, next to where you plug in the charger is flashing/flickering aswell all the time.

What does this mean? How much will it cost, and how do i go about getting it sorted?

Thanks

If you're seeing the same failure to recognize two different Dell adapters, then it's the mainboard that's the problem -- cost  to replace will run $400-500US or equivalent.  Repair may or may not be possible - that would run in the $150 range.