The best and easiest thing to do is re-flash the image again to the box. The lines in the screens can be sorted and theres a tutorial on how to do this on one of the threads. It involves a stanley knife and a steady hand, so i'd probably live with the lines IMHO.
You have the dbox connected to the pc via a cross-over cable.
Leave Dbox power cable unplugged
Browse for the image you want to flash in the first option.
Select your network card in the second option.
Now plug in your dbox and after a couple of seconds you should see flashing on the lcd screen of the dbox.
just thought id put in here.......just been through all of this - took 3 full evenings of trying......what i did was
standard network switch
laptop or pc with lan and comport
standard com (9Pin) pass through cable
connect that all up - and in all fairness it does work but for me to get to this i had to rebuild my laptop - once i had a clean build it flashed straight away - if i'd have done that the first night.......no one mentioned that....