AC Adapter Not Powering on the Computer or Charging the Battery

Unplug the adapter DC cable from the portable computer.
Make sure the AC adapter is plugged into a AC outlet.
Check the AC adapter’s power indicator light.
(Look for a green light on the AC adapter block or a blue light on the connector that attaches to the computer):
When there is no light:
Verify the AC power cord is correctly installed. Confirm the power outlet is functional. If found defective, try another outlet.
Plug the power cord into the adapter brick by using the following steps.
Unplug the Dell GA240PE1-00 AC Adapter adapter AC power cord from the wall outlet.
Remove the AC power cord from the adapter brick.
Use two hands for attaching the power cord to the AC adapter brick. Hold the adapter in one hand, and place the power cord in position over the two or three prong connector on the adapter brick itself (Figure 1).
Using the palm of the hand, push the power cord in fully, until it clicks (Figure 2).
  
Figure 1:Align the power cord.

Figure 2: Press the power cord firmly until it clicks into place.

If power LED on the system is still not on, remove all media communication devices (external monitor, printer, webcam etc). Reconnect one at a time to isolate the defective device, if any.
When the light is flickering:
Dell GA240PE1-00 AC Adapter Verify the AC power cord is correctly installed. Plug the power cord into the adapter brick by using the following steps. Unplug the adapter AC power cord from the wall outlet. Remove the AC power cord from the adapter brick. Use two hands for attaching the power cord to the AC adapter brick. Hold the adapter in one hand, and place the power cord in position over the two or three prong connector on the adapter brick itself (Figure 3). Using the palm of the hand, push the power cord in fully, until it clicks (Figure 4).
   
Figure 3:Align the power cord.

Figure 4: Press the power cord firmly until it clicks into place.

Dell GA240PE1-00 AC Adapter Try the AC adapter on a working AC outlet, when the light still flickers, try another AC adapter of the same type if available.
If there is a error concerning the AC adapter refer to Dell Knowledge base article .

When the LED is on, confirm the laptop battery is functional by powering the unit with AC Adapter.

Reconnect the adapter DC cable to the portable computer and check the LED, when the LED goes off, contact Technical Support when your system is in warranty.
Press the power button and check for any lights on the computer, if none contact Technical Support when your system is in warranty.
When powering on a Dell portable computer, you may receive an error message similar to:
The AC adapter type cannot be determined. This will prevent optimal system performance.
Strike F3 key ( before F1 or F2 key) if you don’t want to see power warning messages again.
Strike the F1 key to continue, F2 to run the setup utility.
If so, check AC Adapter verify it is the Dell AC Adapter shipped with your system.
Unplug the AC adapter from the wall, and from the portable computer, for five to ten seconds.
Make sure the AC adapter is unplugged long enough for the LED on the AC Adapter to go out altogether.
Take out the battery on the portable computer, for more information on how to remove the battery for your specific computer, browse to the Online User’s Guide. Click the make and model of the computer and the preferred language. Download the Setup Guide or User’s Guide.
Plug the AC adapter into the wall outlet and to the system.
http://www.storebattery.co.nz/