I have an HP DesignJet 2500 printer that has been functioning perfectly until just recently. Now whenever I turn it on, a message "Edge not found. Reload media." appears. There is no media in the printer at all. I tried turning it off and turning it back on many times but to no avail. It thinks there is media attempting to be loaded. Could this be a problem with a sensor? If so, I'm not sure where inside the machine to look for this. If anyone has any ideas that may be helpful please email me... cbobcat49 at hotmail.com thanks! Chris

I would check the sensor on the carriage that detects paper. It might be dirty enough that printer cannot detect the subtle edge of the clear film. It is the blue light that turns on on the bottom of the carriage when you load paper.

HP Designjet 5500 Series Printers - Internal Diagnostics and Calibrations
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This is an issue with your starwheel motor. you need to check the cable and functionality. If you open the cover and look down you will see the star wheels and a 2" wide strip of aluminum that is the width of the paper path...it is to the left of that right below the ink supply station.

Who did you order the ink cartridge from and is it a genuine HP cartridge

Try using the HP Print Diagnostic Utility in Windows - HP Customer Care (United States - English).

If you need more help come back.Post / thumbs / testimonial are welcome!

The error code indicates a communications problem between the display and the electronics. Reseat the connectors on the display and the connection to the electronics. If that does not solve the problem, replace parts in this order until the problem is solved: display and display cable, electroncis module, logic board.

When you load the paper, the carriage edge detector measures exactly where the right edge of the paper is located. Then the paper is rolled forward and the edge is measured again. If there is a difference in the measurements, the printer assumes the paper is not loaded squarely and rejects the paper. After you load the paper and the printer asks you to align the paper, take your time, release the paper with the release lever, and line up the right edge of the paper with the right edge of the paper roll. You might have to do it more than once to get it to load. Some plotters are very sensitive and others are more forgiving.

turn off printer, disconect hdd from pcb, turn on then printer beeps, turn off mount hdd back, turno whait ;).

I doubt it. When the printer powers up, it checks to make sure that all modules are in place and functional. If one is missing, you'll get an error message.