Modem or line fault?

[Chrisb_9]

Since Friday the lights on the front of my Surfboard 4200 modem have been going bonkers!
VM upgraded my service from 4Mb to 10Mb on Friday. I haven't noticed any particular increase in speed, but the modem lights are flashing all the time. The "send" and "Receive" lights are constantly flashing. I have rebooted the modem but it doesn't appear to make any difference.
The lights continue to flash even when the PC is switched off! I have looked in the manual that came with the modem, but that is no help either.
Does anyone have any ideas?

[NTLVictim]

Are you modem only, or have you a Set Top Box as well?

[Chrisb_9]

Hi there, sorry to have taken so long to get back to you.
It's a modem only, don't have a set-top box.

[NTLVictim]

My line of thought was epg transmissions etc showing on the modem, but hey-ho..

Do ALL the lights flash, or just some? (when the PC is off)

[Chrisb_9]

It's one of those nights!
The send, receive and activity lights all flash even when the PC is switched off