Light on my modem

If the internet light is not on then it means

1. You are not connected to the internet, faulty connection etc
2. You have no proper drivers for your modem or your current drivers are corrupted
3. The computer has turned of your modem for reason like conflicts or ill-operation of your modem

I guess you also want to know how to resolve the issue (Cause you only asked why it is not flickering anymore)

1. Connect the cable or wireless connection for your ASDL securely
2. Update the driver for your modem and als diagnise the modem
3. same as 2, goto device manager to update the driver and on properties to diagnise the hardware

possible reasons why internet light on SS 4100 is not on:
1. you could be using a router. if SS 4100 modem is in "bridged mode" and has a router configured behind it, then it is normal for the internet light to be off.
2. failed authentication. maybe you are not using the account name/ email account given to you by your ISP and password on the modem's user interface. you can configure the user id and password of the SS 4100 modem by opening up any browser, type the default gateway of the SS 4100 modem (192.168.0.1) login using the email address / account name from your ISP & password, then click on connect. that should bring the internet light on...