I recently purchased a Phaser 6510. Setup went ok and printed a test page. I left it powered up for about 5 days while I traveled for business. When I got back there is no power on the display. I have searched online and tried holding down the power up / sleep button for 5 sec. That did not help. I ran across a post to unplug the ac power cable from the printer to let it sit for two hours. I am in the process of doing that now, and still have about an hour left Can anyone help? Is this a known problem with this printer?