Having network printer connection problems using a Macbook Pro

I hope a "greater mind" can suggest a solution to the following problem:

Up until 2 days ago, I was successfully connected to the network printer at my office using both my Macbook Pro at work and at home (both wirelessly, OS 10.6.8). From yesterday, however, I now only receive the following message when I send a file for printing: "network host (and then its IP address) is busy. Will try again in 10 seconds."

All right, my system admin. advised me to re-install the printer on both computers. I did. In printer set-up, 1) Protocol: Line Printer Daemon - LPD; 2) Address: the IP address of the printer; 3) Queue: secinmac. This is the queue name specifically for Mac use and given to us by the company who installed our network printer; 4) Name: we use the printer's IP address; 5) Location: left blank; 6) Print Using: Generic PCL Laser Printer. Further for 6), in the "installable options" dialog box, I click "Duplexer". Then, finally, I click "ADD". The printer is added.

However, when I try to print a file, I continue to get the "busy" message. The file spools for about 3%, and then the "busy message" appears, and I cannot print. You can imagine how frustrating this is when the problem has arisen from one day to the next! A colleague who also uses a MacBook Pro sent a file to print on the network printer today, and he had no problems! I, however, have no success 😢!

Any ideas that can help me? Thanks, in advance🙂!