HP Laserjet 4000 t printer: Laserjet 4000 t false jam - Attention light stays on

I have an old printer HP Laserjet 4000 t.

I got a paper jam message , but when I searched carefully there is no paper jam.  I took out the paper trays and raised the lid of the printer, but nothing goes out the light of attention.  I even tried to unplug then reconnect the printer, but attention immediately lights up.  Now the orange attention light remains lit and nothing I assure the printer there is no paper jam, so the attention light does not turn off.   What should I do to get the printer to recognize that there are no paper jams and cut the attention light so the printer can get back to a usable state ready?  Please help me as soon as POSSIBLE.  I'm working on a deadline.  Thank you!

THANKS davidzuts and SHThompson!

It was a very good paper jam, but I couldn't find any paper anywhere, and using heavy paper to make out jam was not working.  I went to feedroller.com and looked up the eyes my specific printer.  I tried their troubleshooting and it mentioned ovens and assembled recording, rolls of transfer, sensors, flags, which was all Greek to me.  At the bottom of the list of items that I saw a link to the videos.  I clicked and it took me to YouTube.  There is nothing specific about a for my printer HP LaserJet 4000 t 13,20 paper jam, but there was one called 'how to fix HP printer error 13.20 to 4200 4250 4300 4350 printer HP series'.  I saw and learned how other similar HP printers came out after the ink cartridge came out.  I tried the same rough with my printer and discovered a whole sheet of paper in boots upwards in the roller behind the flipper.  When I took it off the printer immediately turned off the Attention light and returned to the ready mode!  Thank you, thank you, thank you!

Tags: HP Printers

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