Hi Saru/Scouser, Am having exact same problem with mine and is not due to a faulty box. Took my box up my mates and tried it on his connection and it was fine - every channel perfect. Borrowed his and is coming up with no/bad signal message on every channel too in my house. Only difference to you saru is that mine worked fine for about a month so makes it even more frustrating!! lol. Gradually during one day the picture started getting worse until all channels completely lost signal (the night Amir Khan was fighting - didnt miss much anyway! lol). Every channel fine on NTL box. Have posted in other threads but not much help. Tried removing splitters, factory reset, reflashing etc. Bought a variable attenuator which has brought a slight picture back on some channels but nowhere near watchable still. Going to try a booster next but not very hopeful! My signal level is bouncing between 79-85% on most channels too (which it was when they were all working), with the attenuator drops to 70-74 then get slight picture on about 3 channels... oh, by the way, when i first installed the box picked up all channels (luckily i saved the channel list to my pc), when scan now only finds handful of channels which dont work. Will post back if booster has any effect!