I have a LaserWriter Pro 630 connected to my Lombard PowerBook 400 MHz, 384 MB RAM, OS 9.0.4. Most of the time it is great. Occaisionally, I run into a pdf file that will not print. I get an error message that says "The file cannot be printed. A Postscript error has occurred." Sometimes it prints on the retrty. Somethimes it not only does not print, but the printer becomes disconnected from the computer (it no longer appears in the Chooser.) Then I have to turn the printer off and then back on, wait for it to print the start-up page, and try again. This last time I was printing a tutorial for Pixels3D, and the file had lots of diagrams and screenshots. But one of the pages causing problems had only text. Any ideas as to what causes these errors, and more importantly , how to stop them so the file will print? I have an Epson 740, which did not have any problem printing the same file. On the advice of another technical support area, I downloaded the Adobe PS 8.7 driver, installed, restarted. iI appears in the Chooser. I Chose it, closed the chooser window, opened up one of the problematic pdf files, asked it to print. The file spools, the page icon appears on the new Adobe desktop printer icon. The green light flashed a few times on the printer, which normally means it is getting data to be printed, and then nothing happened. No error message, nothing printed. The file disappeared from the desktop printer window (from double clicking onthe desktop printer icon.) I tried to print a second time, after checking that the printer was still appearing in the Chooser, with the same results, only now the computer has "lost" the printer. It no longer appears in the Chooser. It appears to be doing the exact same behavior as with the Apple driver 8, except I don't get the error message. Does anyone have any suggestions?