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Go read "READ THIS BEFORE ATTEMPTING TO FIX A PROBLEM!" and determine if it's your problem or the cable company's problem. If it's their problem, call them and have them fix it.
If it's YOUR problem, make sure that the input line is connected properly to the first splitter. MAKE SURE YOUR SPLITTER IS NOT HOOKED UP BACKWARDS! I see this more often than you'd think.
Make sure your splitter isn't in bad condition. Replace your splitter(s) if necessary.
If this still does not fix it, have your input line replaced.
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