Print head and ink issues

[Branthebroken]

Good day.  I'm at my wits end.   I have a T795 I bought at government auction.  I bought  a hard drive with firmware.  I bought cheap ink.  Initially when I installed the ink, the printer printed a page, but the colour was off.  Immediately afterwards, it told me the grey ink was out.  Then it told me to replace the print heads.  So I went and bought a HP grey cartridge and that solved the problem.   However I was still getting printhead errors.  Again, using knockoffs.  So I bought new HP printheads, and I get a printhead replacement not complete.  When I check the status of the printheads, it says they are ok, but have an X next to them.

I tried starting with, without items installed, I tried to drain any air in the lines using a syringe.  I did notice that while the other colours allowed me to draw ink,  the black/yellow would not let me draw anything and couldn't "suck" anything out.

Any ideas?

Blair   

[mjones5970]

You will need an HP tech to purge the lines. Using special tools and service mode access. 

[D Hook]

How full are the ink cartridges?  The printhead replacement process won't complete if the ink is low on any of the cartridges.

[Branthebroken]

All ink cartridges are above 80% and are all recognized.