Yep have just installed an HP 75 color cartridge into my photosmart 4480 and the bloody thing won't work. I'm getting the flashing light! Install the old empty cartridge - no flashing light! But sadly - no ink either (well actually only no YELLOW ink - part of f*cking HP's scam, not only do you need to replace when ALL the color is used - they'll screw you when only ONE color is empty. A bitter, bitter, bitter experience - and I do so wish I'd replaced my HP with a Canon.) I am not sure exactly where I need to kick it, but I have an URGENT deadline, and if I could I'd firebomb HP. Yes its that bad................
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