[CentOS] Can't print PDFs or PSs in CentOS 5.0

For some reason, when I try to print any graphic PDF (or a PS file made from said graphic), it kills my Minolta 1100 laser printer, and I have to cancel the job, disable the printer and turn the printer off and on as many times as it takes to clear its buffer of the trash.

I'm running CentOS 5.0 and have tried Adobe Acrobat Reader 7.0 for Linux; I have also tried printing the pdf to a file and running it straight through lpr, using the GIMP (although I've NEVER been able to print graphics from there), and even the Image Viewer (which chokes and dies silently while trying to load the file).

Any suggestions? I'm using the standard CUPS print system for all of this....

Thanks.

mhr