the LED being "Black" just means that the device is either turned off or ready for analysis, so this is completly normal.
Please ensure that the LAN cable is plugged into the LAN port of the device and not a CAN port (There are 3 RJ-45 Ports on the back of the instrument, only one is a LAN port).
Per default the IP-Adress of the instrument is 192.168.254.11, but this can be changed depending on the switch positions on the back of the instrument, if you need help with this, we need to know the type of instrument you are refering to (G1234X number on the front Label).
You PCs network configuration must allow access to the 192.168.254.11 IP adress on the interface that is connected to the LC (if you are using that IP-Adress).
Thank you very much, your answer help me today to resolve my problem. Next issue is to see how I can connect the hplc 1260 agilent infinity with the fraction collector Gilson FC 203B, did anyone have already done it before? if yes, how to do it? Thank you