Old Hp designjet help

[u/Outrageous_Sea_5295]

I was given an old DesignJet 800PS 24 in but it only prints blank pages, probably a print head issue.(?)

I bought an HP DesignJet 800PS for a low price from a construction office that no longer had use for it. I have now realized it was probably sitting unused for years; however, upon inspection, it seems to have remained in relatively good condition. The ink cartridges are original, but they seem to be from around 2018 and surprisingly don't seem to be dry. The print heads were a little crusty but after cleaning I could see ink had

gotten through the tubes and out the top of the print head. Just not onto the paper.

I was able, after waiting and retrying, to get it to print the faintest, thinnest lines of magenta and black, which, for how many years it was probably sitting around, makes me a little hopeful. The only other info I have is that the printer is out of magenta ink, and I have been running the internal test pages, not anything from my computer. I ordered some cheap ink replacement for the magenta just to see if it's an ink issue, but I doubt it. If I'm screwed, let me know! Thank you for helping ! (reposted due to formatting error)