I have the exact same problem as the original poster with my 24month old LE40R88BD! It started with my tv reseting itself while I would be playing the Xbox. Then the 'Composite' channel went all weird acid colours. I removed all the connections and hoovered the vents at the back as they were full of dust. The tv was then ok for a couple of days but then would take ages to come on, it just kept clicking. When it did come on, the freeview would not work as it said no connection (wouldnt see the antenna). The picture also went really dark and the strange thing was, if I turned the backlight down, the picture got brighter!! Anyway, 2 days later, the thing refused to come on all together. Luckily I took out the whatever Happens policy with Currys and it's away getting fixed. I'll let you know how it goes.
Stephen - Lanarkshire, November 2009