Can no longer see USB Printer - help needed

Hi
I have a macbook air connected via usb to an hp deskjet 840c.
Always worked fine - today I tried to print a document and the HP print utilities said it could not connect to the usb printer.
I tried several times to change the settings and reinstalled the drivers, but nothing happened.
I reset the printing system, which deleted the printer queue. Now the printer doesn't even show up if I try to add it again on printers & faxes. The printer doesn't show up on system profiler as well.
The macbook usb port works fine with any other devices.
Any hint?
Thanks

Hi alex:
I am not being critical of the Macfixit site, but I would NEVER download a system software update from other than the Apple site.
It is very difficult (translate impossible) to tell from here what happened. Usually those sorts of problems are attributable to changes, but I suspect you have already looked at that.
At this point, I think I would do an archive and install to try to get back to where you were. An A&I will install a fresh OS X while retaining your files, programs, and settings. I always suggest backing up before any software changes. The fresh A&I will install the drivers (including HP) that were originally distributed. You would, of course, need to run software update to bring everything up to current level.
Barry
P.S. If the problem persists after the update, I think I would suspect some sort of printer hardware problem.

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