The lines from the caps to the pump are clogged. You can try to clear them with cleaning fluid and a syringe. If you cannot pull anything through them, remove the caps from the printer, pull the lines off the caps, use a roller of some kind (an unopened soda can will work great) to squeegee the ink out of the ink lines, and use a small paper clip to clear the connection on the bottom of the cap. Thoroughly flush the lines, reinstall them on the caps and reinstall them in the printer and see if this fixes the problem. Ideally, new OEM caps would be the best solution.