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is not a facetious question, because I've owned HP All-in-one printers for the last several years, and there are very important differences between standard "plug em in" printer only printers, and all in ones (fax/copy/scan/printer).
The reason is, that all in one functionality, particularly fax receiving and scanning, require bidirectional communications between printer and PC. "Print only" printers only require drivers, for the PC to send files to them, and for them to print.
All in ones usually require the software be installed on the PC first and will have very specific instructions on how to install.
BTW, if the other USB devices are working, it is NOT an issue of USB drivers etc.
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