i can't believe this! i bought the wrong ink for my printer. i don't know why my printer model is listed on the side of the box. i assumed it meant that my printer's compatible but NO IT ISN'T. i'm really angry so if anyone of you possess a HP printer which is compatible with the HP inkjet black no. 45. please let me know. i could sell it to you. aiyar i guess i could give it to you also...but i just bought it and all ive done is rip open the box and the protective plastic around it. maybe you could spare me a donation? it was almost 50 bucks :( i'm so angry now to find it a good home.