The 49 error is specific to Hewlet Packard printers. When something from the computer that the laser printer does not understand, it will give off a 49 error. When this happens, the printer que needs to be cleared and at the same time the laser printer powered off and turned back on. This may need to be done several times to get rid of this error. It is also a good idea to find out what file being sent from the computer to the laser printer is causing the problem. In some rare instances that it could be the formatter board and will need to be replaced.