Trouble Printing Yellow On HP R80xi+

I have a 3 year old HP Multifunction R80xi ink jet printer that I have
probably printed a total of 2,500 pages on. For some reason I can not get
it to print yellow. I have installed brand new ink cartridges (both black
and color) and have cleaned, calibrated, and done everything else I can
think of. Also have searched HP's site for help. I am running 98SE. Can
anybody give some guidance?

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<Bill>

Brought to you from beautiful Unalaska/Dutch Harbor, Alaska.
N 53° 51.140' W 166° 30.228' (WGS 84)