I have an hp officejet, 1.5 yrs old with 3 yrs warranty. once used the setup cartridge, I used compatible cartridges. they were fine until I went away not using the printer for 1 month. the colour cartridge stopped working, I have been printing b&w. recently I got a set of original cartridges and wanting to start printing colours, but the magenta still blocked, the other 2 were good straight away. I have cleaned the cartridges 3 times for multiple times, check alignment, resit the magenta, reboot the printer, nothing work. what can I do? if I call hp would they void my warranty because I had used compatible before?