Hi Ucinn,
Do you have another computer you can set it up on.
I doubt it is a software/ driver issue, but that will help to resolve this (if possible use an XP machine to test with).
If the black was not working after changing, it could be a faulty print head.
Now that both black and color are no longer printing it is more than likely a faulty printhead or (and this is very rare) corrupted firmware.
You can try and update the firmware and see if that fixes it (not sure it will).
Here is a link to HP's Site for downloading software and all:
http://h10025.www1.hp.com/ewfrf/wc/s...t=3866951#N632
IKE
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