On my 2.5 v6 the dis just looked a bit worn out and missed pixels from the top down in a kind of fadey outey sort of way. My Lad's 1.8T did the same thing. However - on dearly beloved SE the DIS seems to have horizontal lines that dont light up and then soemtimes vertical lines that dont light up. Bizarrely yesterday when I chugged up and down the rainy M1 to Milton Keynes it all lit up perfectly. What causes the DIS to fail and what could be happening on mine that the faiiure is inconsistent?