Need Help with Officejet 4500 all in one printer.?

The printer refuses to print black ink. Im on a Mac running Os X 5.8 and according to my HP dashboard widget black ink is more than 75% full, yet everything that I try to print (test pages, word docs, even tried a scan) is full of color with no black ink. I've tried uninstalling and reinstalling the drivers and... show more The printer refuses to print black ink. Im on a Mac running Os X 5.8 and according to my HP dashboard widget black ink is more than 75% full, yet everything that I try to print (test pages, word docs, even tried a scan) is full of color with no black ink. I've tried uninstalling and reinstalling the drivers and aligning the print cartridges and everything, nothing seems to work.

Please help.
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