Why is the ethernet cable on my modem flashing?

The light tells you if an ethernet cable is plugged into the modem is flashing. It does it with the ethernet cable connected to my computer and xbox 360. These are the only ones i have hooked in. Also, the light that says internet is blinking, but not as fast. Does this mean that I need to replace the ethernet cables or there is something wrong with the motem, or something else? What should I do?Why is the ethernet cable on my modem flashing?
It may be a case where 2 of your ethernet ports are short circuited with the ethernet cable. Try checking the connection.

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