BLM124,

This error typically signifies that a specific cable is not connected or is not seated correctly, and will normally name the specific cable in question. The image you posted does not open. Also, what was the diagnostics testing when this error came up?

The error occurs during the Cables section of the diagnostics.  It says "Msg: Cables - Check the following cables: LCD cable;"

I'm not sure where is it or how it became unseated.  The screen seems to be working fine otherwise.  The rest of the diagnostics show no errors.

BJM124,

Click the link below to download the online service manual. The manual will provide information for removing/replacing parts in the computer. The cable may need to be reseated.

Latitude E6420 Drivers, Downloads and Manuals