HP LaserJet 2600n poor print quality/streaking

I am the original owner of an HP LJ 2600n with a poor print quality/streaking issue. The poor print quality occurs with any and all paper that I use (currently Hammerhill 20# stock) and occurred with Windows XP and Windows 7. The print cartidges are all genuine HP and changing them does not make any difference. I have cleaned the front door roller with no improvement. My firmware version is 20070716. The black cartridge is at 33%; yellow 75%; cyan 91% and magenta 91%...
Any advice would be appreciated. An example of the output is attached below:

Hi everyone,
I have resolved my problem. I took a leap and purchased a new toner cartridge, and the new catridge works great. Installed it yesterday and the test page comes out clean, clear and with no double image. I'm happy.
Apparently the printer had not had a print item sent to it in over a year. I think that was actually hard on the toner cartridge.
Tthanks to everyone for their help via private emails!
mark

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Please click the Thumbs up icon below to thank me for responding.
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Click the Kudos Star!
It is a nice way to say “Thank You” for the help.
Although I strive to reflect HP's best practices, I do not work for HP.
Kind Regards,
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HP LaserJet 2600n poor print quality/streaking

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