I have a Motorola SB5101 modem and the amber light (PC Activity) always used to blink rapidly. Today I noticed that it is on steadily, but once in while, blinks slowly for a few seconds. I called my cable company and they said, in as many words, as long as I can connect to the Internet, what's the problem? I was just curious as to why the change in modem behavior. BTW - my OS is Windows 7 64 bit.