troubles with my EMC6

troubles with my EMC6, Serial # 8920419. There is no communication between computer and machine. When I power up, there is no display on the the kepboard, and there is no icon/indicator on the ENS software to select the machine, On the CPU , I see five LEDs ... 1 green, and 4 reds. All are lit except the fourth red LED. I've had the power supply checkED as well as the keyboard. They ckeck out OK. If you have knowledge of this problem, PLEASE .... I NEED HELP.

:o WandaJ