I just purchased an HP DJ 5000ps and it has been sitting in a barn for a while so I have cleaned it all up and have got it to print a few things but the yellow and magenta print heads are degraded so i purchased new ones but when I put them in I get a "reseat" message on the lcd... but if i put the old ones in its fine... So after many hours of pulling my hair out I found something that said i needed to replace all the printheads at the same time in order to get them to "seat" so before I spend more money on more printheads I was hoping someone can confirm this for me.... Thank you very much in advance