Please give me detail instructions, step by step because not very computer literate to solve printer problem. Flashing green "PC Load A4" causing printer not to print. Thanks CK

What this means is that the print job you sent to the printer is formatted for and designated as being ready for printing on A4-sized paper, which is a European size that is 210 millimeters wide by 297 millimeters tall. This is close to what Americans will refer to as letter size as that standard is 8.5 inches by 11 inches while A4 is 8.27 by 11.7. If you have standard letter-size paper loaded into the printer and you want to print on such paper, then you need to go into whatever program you are using to write the document (for example, Microsoft Word, Corel WordPerfect, etc.) and set the option in the Print... dialog window to print on Letter rather than A4. You also need to cancel the print job currently in the printer. This is done by holding the Shift key on the top of the printer and pressing the button that says "Reset" underneath it in purplish-red. This will flush the memory of the printer and make it ready for the next print job. As it's been a few years since I last worked on one of these printers, I cannot remember if you also need to hit the Online button first (so that it is offline, indicated by the light being turned off on said button) before you can reset the printer but if so, then just hit that button, reset the printer, and then hit the Online button again to bring it online.

This should take care of the problem for you. If you have any other questions about this issue or other concerns about your Laserjet 4 series printer, feel free to drop me an email. You can find me at Best Deal Computers as I am the owner. :-)