my Television is showing the same channel when i change /tune different channels

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here i have a major problem in my TV, when i switch on my tv, i will get a channel, when i change the channel, i am getting the same channel, for example, when i switch on first i ll get ESPN, when i select some other channel, same ESPN is being relayed, i tried tuning, but it doesnt work, i tried to store again, but it doesnt work still..i dont know the reason, when i select any other channel, the same ESPN is being relayed, please help me in this problem.. waiting for ur valuable information... happy mylotting..