There is probably 1 chance in 500 that there is some problem with your LNBF or receiver. If you'd read the posts here, you'd see that there are many many people with the same symptoms, who think their lnbf is bad, but eventually they figure it out.
DTV/Dishnet systems are easy to aim because they are strong sats, and the receiver is already set up for the freq/SR and LO values required to recieve those sats. As Steve said, you have to find your south sat. But to find any sat, you have to have your receiver set up to match the LO freq of your LNBF, and you have to have the receiver set up to be looking at transponders known to be active on that sat. The default transponders on receivers are often obsolete, and if you don't have all the parameters right, you won't see anything. So the question for you, is how have you set up your receiver, re LO freq, and what satellite, transponder and SR value are you looking for?