DM500HD Update
I have now ascertained the problem I have been experiencing and the answer is that this DM500HD appears to have a compatibility problem with my Technomate Diseqc 1.2 motor, it will find the satellite but will not scan the services but when I lock the dish on say Thor, take the motor out of line it scans Thor no problem.
I have made contact with Dreambox in Germany and am still awaiting their response. I would have thought that prior to releasing any new product onto the market testing must have been done.
For the benefit of others I will publish their response on here when I get it.