Problem has been solved, but knowing how might save others. Use 3 XP Pro desktops printing to networked 3015dn Lazerjet. During night utilities paper ran out during automatic sequence. In AM also did print jobs that got hung due to no paper. Added paper and command did not clear in Start, Setting, Printers& Faxes. Opened and closed all doors and even changed paper type. Turned machine off and rested. Still not cleared. One other desktop had same block. But a third who had rebooted worked. Solution was to reboot the desktops. Apparently the print notifications that push to desktops to tell of print status locked up the desktops. On mine I could not close that notice until I had gone to Task Manager. But once blocked, then reboot is only way to clear. It is obviously an HP notification bug.
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