Naboo - How do you solve the error message “A00 communication alarm with base”?

A00 warns that there is no communication between the Display and the I/O card. 
As a result the unit will interrupt any function and displays the message. 

This message requires the intervention of an authorized technician; causes of the fault must be investigated as per prescriptions.

Description

The display is powered by the RJ45 connector that also transmits data. Two scenarios are possible; or we are in the presence of a bad electrical connection or the firmware in I/O board and the software of Display board are not aligned. In the latter case, the display will automatically try to update the FW in the I/O board. 
Check if SW (display) is updated to V.12 for Reloaded V.20 for Boosted.

Warning

- The data cable with an RJ45 connector that connects the display to the I/O board must be connected to the KEYBOARD connector. By connecting it to the EXP connector, the I/O board will be irreparably damaged. 
- Be careful not to tug the connecting cable as this may damage both the cable and the connector soldered to the board.

Checks

Check the following: 
- RJ45 cable insertion on both cards. 
- Try replacing the cable 
- Try replacing the I / O board 
- Replace the Display