If your system is a DSX, the light is flashing because you have new caller ID's that you have not viewed. You can look at all of your caller IDs or have your vendor turn off this feature in class of service
Blinking Light
Two reasons the light on top of your screen might be blinking or on steady.
Blinking light on top of Display NEC Aspire
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Which NEC phone/ phone system do you have?
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