dell laptop ac adapter not recognized

started receiving the dreaded error message "The Laptop AC power adapter type cannot be determined. Your system will operate slower and the battery will not charge. Please connect a Dell 65W AC adapter or higher for best system operation"
The laptop runs fine on AC power but doesn't charge the battery. I have tried the following after reading others with similar problems:
1) Disconnect AC
2) Shutdown
3) Remove battery
4) Connect AC Adapter
5) Startup
6) Under the Batteries category (in Device Manager), right-click the Microsoft ACPI Compliant Control Method Battery listing, and select Uninstall. Do this for each instance (I had 2 batteries installed, so 2 instances. Most users will only have 1).
7) Shutdown
8) Disconnect AC
9) Insert battery
10) Connect AC
11) Startup
This did not work then I found this question that was the same problem (different model) and it most likely was a hardware issue since the message appears when booting up.
Worldwide failure pattern
A deeper dig into search engine results reveals a wide spread pattern. The problem seems quite common and most of the resolutions point towards replacement of the dell AC power adapter.

A few resolutions to this problem found while surfing:
- Call DELL - explain the problem, insist on a free DELL AC power adapter.
- Power-down, remove battery, hold down the On/Off button for more than 10 seconds.
- Check the power leads - specially coming out of the dell 9T215 adapter, fix if possible.
- Slowly turn the plug into the jack at the back of the laptop, see if it charges again
- Power-on, after the BIOS message, unplug jack, press F1 and immediately replug jack
- Update the BIOS (use with caution - power failure during BIOS update is fatal
None of them worked in this case.
The reason why someone would recieve this error is because the dell 9t215 is no longer able to provide 65w for the laptop. Do NOT listen to the other answerer and just use any voltage you want. Its like just trying to plug in random things and the very likely result at the end is a fried motherboard.
Either the charger is no longer able to provide sufficient power (65w) or the Chip inside the charger is damaged.
Dell laptops are the only ones that recieve this error because each Dell product has a chip located inside to notify it is a Dell C2894 charger or laptop that it is being connected to. If the chip is damaged, it won't verify it as such and will give you an error.

You simply need to replace the charger and you will be as good as new.
You can look online for a new charger but I would personally suggest you visit laptopadaptershop.com.au instead. all products has 1-year warranty and 60-day money back