On my Laserjet 4, when I try to print, the form feed light comes on and remains on until I take it offline and press the form feed then it prints a blank page with one line of random characters at the top of it. No error messages appear on the printer and I can print a PCL demo test page with no problems. The computer thinks it has printed the document and completed its task. I certainly appreciate any help anyone can offer. Thank you.
Sounds like one of two possible problems. 1) The document you are trying to print isn't sending an EOF (end of form) to the printer so it doesn't print the last page or 2) which I suspect is the problem because of the one line of characters is that the printer drivers are wrong or corrupt. Try reinstalling or changing the drivers or delete and reinstall the printer.