The best way to go about this is going to be a master reset. First thing, as others have said, is to locate G1. If it's in the sat menu, select G1..let it move to where it thinks G1 is. This will be wrong, because the sats are still set up for whoever's dish the box came from. When it stops at G1, select channel 5 and manually drive east or west until you get a picture of analog channel "Classic Arts Showcase" it will have "ARTS" in the lower right corner of the screen. After finding this channel, select 3 and you should have a DCII lock with green light. Once you have a lock on ch3, you can do the master reset. After the reset, G1 will be at 5000, right where it should be. Let it sit on 3 for a little while so it can download the satellite list. After the satellite list is populated, you'll want to program C3- to the east of G1 and C4- to the west of G1. Use channel 7..C-Span on C3 and 9 or 10...QVC and HSN, on C4. Once you have C4, G1, and C3 programmed in, the unit uses the distances between these sats to calculate the positions of all the other birds, and when I did mine, it's calculations are pretty darn close! I hope this is of some help!