Using the directions on previous post, the 508 hooked to lnb direct, perform check switch test. If un- successful, the receiver is either defective or lnb. Assumming that your cable run is good, that is. This is a process of elimination. If test is good, it's time to locate the satellite of choice. After you peak the dish, turn off the receiver and allow approx. 30min for a software up-grade. After the up-grade has occurred, you should be ready to install other needed parts required for your set-up. The 4900 is 1st generation hardware. It will not operate with DP hardware without DP adapter. You said that this was an operating system that has been out of service for ????. So, you should understand the correct wiring? Current software for 508= P 4.05 4900= P 3.26