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HP Recommended
Latex 310
Mac OS X 10.8 Mountain Lion

Changed out printhead on LC/LM and it show up as out of warranty although it was brand new out of box.

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HP Recommended

Check out first expiration date written on printhead...if date expired - replace the PH.. If date is OK try cleaning gold-plated contacts in carriage and printhead and try again. If result is the same - you have to replace PH. If there's no progress - call hp tech support...

Also check latex forum:

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