How can I fix a Thomson DV3 Digibox with no power lights?

My Thomson DV3 (B?) has no power lights (not even the red one!). I've done all the usual stuff: Removed the LNB and checked for shorts, checked the fuses (both), tried a forced firmware update (whatever the hell that is!)....all to no avail. The real kicker is that I applied for HD last week (it's an 8-10 week lead time by the way and they don't tell you that when you order online) so I don't want to fork out £65 for a call out....any help out there?