Dell E7240 keyboard not working

ianh21,

Check your connections for the keyboard. If the previous keyboard was not working on the computer it could be the connection to the motherboard. Return the other one you purchased and get another backlit keyboard. 

How to Troubleshoot the Backlit Keyboard on Your Dell Notebook Computer

the old keyboard didn't work.  

the mousepad is now working since i ran dell system diagnosis but no joy with the keyboard.

under device manager it shows as a standard ps2 keyboard so it must detect it.

could this be a problem with the motherboard?  

i cannot return, over 30 days.

my bios, latest version, doesn't show any keyboard options.

ianh21,

Yes, it very could be the motherboard connection. Can you plug an external keyboard in the computer? If so, run the diags by following the information below.

1. Power-on the computer.
2. As the computer boots, press the key as the Dell logo appears.
3. On the boot menu screen, select the Diagnostics option.
   The Enhanced Pre-boot System Assessment window is displayed, listing all devices detected in the computer. The diagnostics starts running the tests on all the detected devices.
4. If you wish to run a diagnostic test on a specific device, press and click Yes to stop the diagnostic test.
5. Select the device from the left pane and click Run Tests.
6. If there are any issues, error codes are displayed. 

hi

ok, touchpad works, replacement brand new backlit keyboard doesn't work still.

ran diagnostics and this shows:

Cables - various tests

test result: fail

Error code: 2000-0415

Validation: 91253

Msg: Cables - check the following cable, jumper, connection or sensor: Keyboard

ended.

what exactly is wrong then?  motherboard connection?

any response?

hi

any further help, see below post.