I have a dell latitude laptop, all was fine when the next moment my computer completely switched off. On restarting it, I noticed the battery light flashing orange:red - or is it green:red continuasly. If I disconnect the AC cable the computer shuts down immediately. When selecting the battery icon on the right hand side (bottom) of the computer it shows battery 0%, when I double click it shows me online, critical. I am under the impression that the battery is not charging at all. how do I correct this?

Step 1 Find the wireless switch, located on the front of the E5400, to the left of the touchpad.
Step 2
Slide the wireless switch into the "On" position to enable wireless radio communication on the Latitude.
Related Reading: How to Turn on Wireless on a Dell Latitude Laptop
Step 3
Click "Start ' Control Panel ' System and Maintenance ' Device Manager." Double-click "Bluetooth Adapters."
Step 4
Right-click the Bluetooth driver and then select "Enable" from the context menu, if available.
Step 5
Navigate to the Dell Support website in a Web browser if the Bluetooth Adapters category is not listed in Device Manager.
Step 6
Click "Start Here," then "Drivers Home." Click "Choose From a List of All Dell Products," then "Continue."
Step 7
Click "Laptops," "Latitude," then "Latitude E5400." Choose your operating system from the associated drop-down menu.
Step 8
Expand "Network." Click "Download File" next to the Bluetooth driver, then "Download Now."
Step 9
Launch the EXE file when the download completes. Follow the on-screen instructions to install the Bluetooth drivers to the computer.
Step 10
Restart the Latitude following setup to begin using Bluetooth on the E5400.

Restart the computer and as it is restarting Press F11 and follow the on screen instructions. If this does not work then one, change is necessary which is, as the computer is restarting ,Press F11 and CTRL together and follow the on screen instructions. Some times the key combination is different so try F10 if the above does not work. good luck

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the light next to the Battery LED is the hard drive activity LED (HDD, Battery, Wifi, Bluetooth)
http://support.dell.com/support/edocs/systems/latxt/en/html/about.htm#wp1206073
Off hand, I'd say overheating is a possibility so try using a can of compressed air to blow out the cooling vents and also run diagnostics on the cooling fan (Power plus Fn key to enter diags) If diags finds a hardware issue call Dell Tech

Hi..
This seems issue with the power supply.
If the computer is in warrenty call dell.

Thanks
Smith

HI, check soldering on Fuse 1 right next to the power inlet plug, just fixed mine.

you will have to dissassemble it completly to get acces to it

some shortage inside the computer, go for technical assistace from qualified technician

The CPU the next time observe to see if the fan is running......it may not and the CPU is overheating.