Currently I am having a Mac OS X. And I have the HP Photosmart C400 series. Another mac has already installed the printer software and everything before me, but the installation guide it says that you can connect up to 5 computers. I install the software in my turn, prints etc. But impossible to scan anything at all! The printer says it failed to connect and another computer is already using the system. This should leave and I have to restart the system. Except that the problem remains the same.
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