no channels found dn800hd se

hi all i have a problem with my dm800hd se.
last night i had it all up and running fine but when i have come to turn it on this morning its saying tune fail and now wont find any channels.
i have digitalworldz v1.1 image loaded as this is the only image i have found that doesnt say tuner a and b empty.
this morning i had green screen a few times but not since i reflashed it.
its a 2.10 sim
yesterday i replaced the lmb and it was after this i had everything up and running.
can anyone please advise me
many thanks
jamie