Most likely your third-party inks sludged up over time either inside the printhead or on the bottom where the ink comes out of the channels. It's very common and if that's the error, can most often be repaired by cleaning the printhead manually. Do the following:
Turn the printer on and wait for the printhead to start doing it's startup slide. Once it's moving, unplug the printer so the printhead is free to slide left and right. Cut a strip of parchment paper and cut a half sheet of paper towel in half once more to make a square. Fold that a few times to match the size of the parchment paper. It should be wide enough to slide under the printhead, but provide coverage in case liquid seeped through.
Spray your paper towel with 80% Isopropyl Alcohol and 20% Windex (with Ammonia). Once the paper towel is throoughly soaked and resting on the parchment paper, place it where I put the purple box background in the image.Now, remove the ink cartridges from the printhead. And slide the printhead carriage OVER the paper towel. Let it sit for anywhere between 15 minutes to overnight if you can. While you're waiting, get a Q-tip soaked in IPA and manually go over each of the nozzles. Making sure there's no ink left at all on them.
Carefully remove the soaked paper strip and parchment. And install your ink cartridges (preferably full) and run the head cleaning process through the tools/software with nozzle check patterns inbetween until you achieve a clean nozzle print. You may have to repeat this a few times to clear bag clogs. But you do not have to remove the printhead which takes a lot of the risk out. Also be VERY careful about spilling liquid anywhere as that will be the end of the printer as soon as you power it on. Hope this helps.