iv had some problems over the last 2 weeks with my dm800 clone , for some reason it was getting stuck at the dream multimedia boot screen and the bar underneith the logo was stuck under half way, after countless flashes it was still doing it , i took a wild guess and cut a hole on top of the casing roughly in line with the cpu heatsink and tuner, wired up a 12v 80mm X 80mm X 25mm fan from maplin electronics and wholla its never done it since every boot is a succes, this might not be everyones cup of tea but iv been up every street and avenue and this has fixed it instantly, might be an idea for the next guy who has this problem cheers