got a problem with my (several year old) HP 5740. When I try to print, I get the message "opening printer connection," but the message just stays there, the connection never opens, and nothing prints. it used to work fine. The problems started when I had to replace the black ink. For a while after I put the new cartridge in, the ink light stayed on, but I eventually got it to recognize that it had ink. But then this problem popped up. I've tried about 3 different sets of drivers (including the ones it came with and the most recent ones). It's connected to an airport extreme, and neither computer on the network can print to it (one running 10.5.4 and one running 10.4.11). I'm totally out of ideas... any help? Please?