The SV8000 is under powered to run a DPP1000 LNB, you need at least 750 mA of DC current to get that LNB to run right, most FTA receivers can only supply 500 mA of DC current, your problems could be lack of DC current to run the LNB.
The only things that will run that LNB correctly are an OEM receiver from Dish or Bell and a DP44 power inserter from a DPP44 switch.
The speck's on that LNB are DC voltage input 20 volts DC, at 750 mA to run right.
Also to see if the dish is aligned correctly use satellite 119W and TP 12414L on channel 101, this is an open channel, then check 129W TP 12516R on channel 9599, this will give you the message "You have a dish on 129W".
If you see these channels then the dish is aligned correctly.
Also this LNB uses band stacking, this gets all the transponders down one coax, thus the OCS-DP for the LNB type, it also needs coax rated at 2.5 GHz or swept to 3 GHz or you will be missing a ton of transponders.
This LNB has an internal Diseqc switch so there should be no external switch in the way, unless there was a need for more then 3 receivers in the original install, the a DPP44 switch(or more) would be used.