any tutorial for upgrade ..
you know how to install software ....
if boot's working, it's possible it's the firmware that's corrupt and you can have a solution just re-writing it again with romupdate procedure (it's available on net or on mediastar site I suppose and you need a flashusb for it).
If it's a video problem there is no solution that looking for an assitance center for it
thanks you all guys for reply me but now i am fixing my issue my box working very well again :thum: