Hi Red
If the receive light keeps flashing, & doesn't settle & go solid, then the modem is having trouble locking onto a signal.
Have a look here:
http://homepage.ntlworld.com/robin.d...ghts.html#ltsb
Quote:
Surfboard 3100 or 4100
(snip)
Receive:
Next the cable modem begins searching all frequencies on the cable for a channel which looks as if it is carrying the cable modem downstream data. The Receive light flashes while it is searching - this can take several minutes if the cable modem is new or after a hard reset. The cable modem remembers in non-volatile memory the frequency it last successfully used, and it tries that channel first: if that works, this search process will take only a few seconds.
If the Receive light never goes steady (and you have to watch it for a long time), then there is a serious problem with your CATV feed, or the local UBR is not working: check that your CATV cable is properly screwed in to the back of the cable modem. If this condition persists, contact your local ISP's Customer Service. When the cable modem has locked on to the downstream data frequency, the Receive light goes steady.
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Best bet is to call Tech Support, or hope that one of the helpful ntl people here comes along to help.