HP LJ IIIP was turning itself off after a couple of minutes. I suspected and replaced the power supply. Printer now stays on. When powered on, it completes a self test sucessfully and displays no error messages. I can print a test print using the buttons on the front panel. The print looks fine. It says it is 'ready' and is 'online'. I cannot get it to print from my PC. I changed the cable and tried printing from another PC but still no print. Doing a 'print test page' from within the printer settings page in Windows doesn't work and it doesn't work with a wordpad file. I queues up but then errors. I was told that there is a 'reset' button under the back cover on the left. I pressed it and the printer does an 'engine test' and prints a page with a lot of vertical lines on it. Still won't print from the PC.