Dell inspiron 3542 keyoard not working

[musanide]

i have a dell inspiron 3542, the keyboard works with all the keys when the laptop turns on, i even go into the Bios setup and do all that i want, but once the Os start to load the keyboard stops working completely.. I have tried the following diagnostics:-
1.Installed different versions of windows os.
2.Installed Ubuntu Os
3.Update Keyboard drivers from the official dell website
4.Tried different keyboards.
5.Updated Bios firmware.
6.Flashed a new Bios firmware and even changed the Bios Chip
and yet the keyboard couldnt start working normally, any help or advice will be highly appreciated..

[mon2]

Sounds like some type of a security lock.

Have you tested with a SAFE MODE of Windows OS boot ?

[musanide]

Originally Posted by mon2

Sounds like some type of a security lock.

Have you tested with a SAFE MODE of Windows OS boot ?

i have not tried safe mode, i will try it today

[mcplslg123]

Had a look on KBC pins and kbd connector for corrosion/liquid damage??

[mon2]

Had a look on KBC pins and kbd connector for corrosion/liquid damage??

Keyboard works fine in BIOS mode; halts when any OS starts to load. Suspecting it is some security trigger.

[musanide]

Originally Posted by mon2

Sounds like some type of a security lock.

Have you tested with a SAFE MODE of Windows OS boot ?

tried the safe mode with windows 10 still no response,,, and the thing is the keyboard becomes completely off when the os starts to load until it fully loads.. not even a single key works ,, and when i check from the DEVICE MANAGER it shows me the standard ps/2 keyboard.

[musanide]

Originally Posted by mcplslg123

Had a look on KBC pins and kbd connector for corrosion/liquid damage??

there is no sign of corrosion or water damage on the KBC or on the MB, and the keyboard works in bios and without OS, but once the os starts to load,it stops

[SMDFlea]

Originally Posted by musanide

there is no sign of corrosion or water damage on the KBC or on the MB, and the keyboard works in bios and without OS, but once the os starts to load,it stops

Did you notice when this started happening,was it after a windows update

[mon2]

Doubt that you have a PS/2 keyboard.

It should be operating using the internal KBC controller IC.

Attach an external usb keyboard and see if that works for you.