From Direct TV:
WHAT'S WRONG:
You have no picture and a message on your TV screen says, "Searching for satellite signal. Please stand by."
POSSIBLE CAUSES:
A signal isn't getting from your dish to your receiver. This may be a cabling problem.
Your dish isn't picking up a signal. Your dish is blocked or may not be pointed correctly, or there is a problem with the LNB on the dish.
Your receiver is getting a signal but isn't processing the signal correctly.
A very severe storm has temporarily interfered with the signal.