I have a 4900 model receiver which I've had since I first signed up with Dish in '99. I've eventually put it into my daughter's room as I have upgraded to 501 to a 721 and now to a 622. Last night she told she was getting a error message on screen, I went and took a look and noticed she had a lost sat signal. I did a smart card reboot and a check switch and it came back as unknown/no switch detected and was only seeing 110 sat. The thing is my 622 and 501 are working fine. I have a Dish 1000 and a SW64 installed. I called tech support, told him my problem, what I already did and he said the problem was with the switch and not the receiver. Since I'm not signed up for the warranty plan, a visit would cost $50 to check it out. I told him thanks but no thanks. I went and checked the power on the sw64 to make sure it was working and double checked the 622 and 501 signal strength / configuration which were all good. I then pulled an old 2700 model receiver out of the closet and decided to hook it up to my daughter's line. I called Dish to reactivate it (and deactivate the 4900) and after a software update and a check switch it is working fine (my daughter could care less as long as Nickelodeon is on). So I believe the problem isn't the switch or the wiring but the 4900. Glad I didn't waste the $50 and even more glad that I kept that old 2700 model after all these years. Therefore, does it sound like I'm right, do these legacy receivers sometimes malfunction (software or otherwise) when it comes to recognizing sat feeds and switch configs?? Should I try the 4900 on another line to verify?