Flashing green on the bottom LED means it is trying to connect, which normally takes about seven minutes. If it flashes green for longer, then it's not picking up a signal either because it is isn't activated, or because the cable is broken or damaged.
Was there anything in the way of instructions, and a number to call to activate? Failing that you'll have to phone it in and see what the support staff advise.
Best case it's an easily sorted activation issue that can be done remotely, worst case the cable is damaged or disconnected, and that will need at least one technician visit, possibly more if the outside cable needs re-pulling.
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Worth calling the activation number again just in case they had the wrong info.
Call on - 0800 953 9500 – you will need the serial number off the barcode sticker and also your account number, Call now but at 08.00 (Mon-Sat) or 09.00 (Sun) for the best chance of getting through quickly.
-------------------- John --------------------
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.