Channels gone ..confused

Hi I bought an openbox DM500s several weeks ago and all has been fine up until this morning.

While I was watching sly movies the screen froze so I switched to another channel which in turn gave a blank screen except the details at the bottom.

So I rebooted the box but still the same. Since then I have rebooted the router, swapped Ethernet cables and restarted enigma BUT all I get are the free view channels and on the premium channels I just get a black screen but with the details of the program at the bottom.

I do not know the password to get to the system menu and hope that there maybe something simple that is causing the problem.

Any help appreciated.

Thanks

Thanks for your quick reply. It is a DRM01 OPEN BOX DM500-S SATELLITE RECEIVER.

I will contact the guy who I bought it off.