I was wondering if hp51649a could be refilled. I asked the guy at the shop and he said it can't but he's got this confused look on his face, so I'm just gonna have to find that out here. Anyway I refilled the cartridge anyway. I bought 3 colors refiller for HP, made a hole and filled in the ink, and got some plastic bit to cover up the hole. I did exactly what i've done with my black ink, and everything went fine apart from that the color cartridge doesn't communicate with the printer. I tried to print a test page, allign cartridge and clean cartride but i failed. I kept getting this error message saying check if color cartridge is installed. I've cleaned the metal bit and everywhere, but still the printer wouldn't pick up the cartridge. Can anyway suggest something here? I wish HP had a refill-able hp51649a. What a damn rip off.