I tried the first step you recommended, but it didn´t
work.
How are you attaching the printer to the computer? I have been assuming that you have been using the USB port as you said it was detected in the System Profiler.
Assuming a USB connection, let's try a different tactic. Make sure that the printer is attached to the computer and turned on when the computer is booted up. Now open the Terminal (/Applications/Utilities). Copy and paste the following into a Terminal window. After you paste the command, hit the Enter or Return key.
<pre style="font-family: 'Monaco', 'Courier New', Courier, monospace; overflow:auto; color: #000; background: #DDD; padding: 0.2em; font-size: 10px; width:400px">/usr/libexec/cups/backend/usb</pre>
Copy and paste the results in a response to this message.
Matt
Mac Mini G4; B&W G3/300