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The cyan light blinking (and the other two colors not blinking) means that the cyan cartridge is exhausted and needs to be replaced.
When you say it will only print settings - do you mean it doesn't respond to any print requests except to press the Demo Page or Settings Page button on the printer itself? or something like that? if so, that would confirm that the Cyan needs replacing, esp. if the demo page printed out contains some account of color levels.