It was definitely the cartridge. And, blowing air through it via the vent holes over the sink actually resolved my issues (maybe temporarily?) and I was finally able to get through a couple of A3+ prints thank goodness!
Maybe the pad on the outlet hole was dried up or obstructed somehow and...
Hi, I have the same problem as @cosmos. My PM looks basically the same as the result shown in their first post (NOTHING), except all my other colors are good. I tried everything they did (cleaning, deep cleaning, nozzle checking in between all, and soaking the head in windex overnight -- the...