Just to cover basics, it could be the LNB,coax or fittings. Also check for cuts in the line. If possible,check tripod mount with a real level. Those built-in jobs are stuck on with foam sticky tape a lot of the time and could be off. If using the 500 dish,try to find a dual LNB. To use for aiming. Just take off the existing LNB, put the dual on one side, aim dish, snug the bolts, and pop the LNB bracket open in the front, slide the dual over to the second sat. location and check signal. If settings of dish are correct, once you find one, the other will be there. The foil method will not work on all applications because sometimes either the meter or the LNB are non-selective of which sat. is showing signal. Could get same reading whichever "eye" of the LNB is covered. Something else I have rarely seen on here- maybe you have offended the satellite gods and they don't think you deserve both sat.'s!(HaHa)