Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Hopefully, this may merely be a case of a rather old and getting-cranky machine. In which case, if so, this is a temporary fault.
I advise you first, to unplug the laser printer in question, and leave it unplugged from the power for at least 1 hour (or as long as overnight.) That allows it to cool down and rest/reset.
After that, see if it powers On in an OK status, after removing all paper from all paper trays, and seating the paper trays carefully in place. (Expect, if all is well, a message about Paper Out Tray 1 and 2 or the like.)
Let me know how it goes, please. Thanks.