I recently got a printer from work that had been out of service. I purchased a refill kit, and got the black to work great, the yellow to work great, but the red works good, and the blue hardly at all. It is an HP 950C with the 78 color and the 45 black. I have tried injecting "solvent" into the blue tank, using pressure and vacuum in the fill for the blue tank, and soaking the printhead in alchohol for 14 hours. The red is working better now, but the blue is just now barely showing spots of ink. I am cheap, I know this. But I have tried this before and I feel there is a way top make it work again. it wasn't out of comission for that long. Anyone have any tips or tricks?