You may have the new dish pointed at Optus D2 rather than Optus D1.
If the old dish has an 11300 LNB , here's what i suggest you do.
Make sure that the freeview box from the house is working properly then take it and connect to the new dish , move the dish in small increments till you get a picture.
have you had a look at these guides? http://freeviewforum.co.nz/forum/topics/freeview-satellite-adjustin... and http://freeviewforum.co.nz/forum/topics/freeview-satellite-aligning...
I saw this and followed the link, did the first steps, and signal went up to 35%, just have to move the aerial a bit more
I've been able to go out and fiddle with the dish and one thing I had incorrect was I didn't have the pole at 45 degrees setting so the dish wasn't sitting on a vertical pole. I've changed that and then put the dish at 42 elevation. Can someone please look at the photo I took and confirm if it's correct for 42? I've lined the bottom of the metal by the nut with the 42 position.
It's impossible to tell from your photo without knowing the details of the dish and it's alignment procedure. Doesn't look right to me in the photo but should it align with the nut, the mark on the metal plate or the edge of the metal plate? It looks to me like it hasn't been assembled correctly.
P.S. Good site to find your aiming point here http://www.freeviewshop.co.nz/dish-angle-calculator-i-16.html Get your coordinates easily from Google Maps.
Thanks for all the advice but after trying everything I still couldn't get the dish to line up correctly so I gave up and called out a professional who lined up the dish quickly and easily using his digital meter.