I have an old HP deskjet printer, I really don't print much and hate to buy a new one. I recently ran out of ink, took both color and black cartridges to Walgreen's to have refilled. (btw, they are running an unadvertised special - $5 for each). My printer thinks it is still out of ink. After doing the Google thing, I read something about resetting the ink level - cover certain numbers with tape etc. It didn't make much sense to me - is there a simple way to do this?