Console not Start

I have a problem that I cannot solve with a jands Echelon 1k

I would really appreciate it if you could help me too.

The console worked very well and from one moment to another it stopped responding when turned on.
At first the screen was blue and did not show any information, then every time it is turned on only some lights of the keys remain lit without showing anything on the screen.

I have obtained the Technical Manual but I would like to know if you can help me.

I know that the table is old but it does its job perfectly where it is installed.

forgive my english, it has been translated from google.