Lost communication with HP CM1312 Multifunction

Hello -

We have a USB connected HP CM1312nfi multifunction machine connected via USB to a Toshiba laptop running Windows 8.1.  Everything was working fine, scan and print, until I needed to attach USB hard drive to copy some files.  Under the users domain log-in (which has full administrator rights on the local PC) the external drive was not recognized.  I switched to a local machine account and was able to access the external drive.

When we plugged the multifunction back in and tried to scan we got a Scanner Not Found error.  After several attempts to get the system scanning again (including a re-boot)  I deleted the printer and scanner from Devices and Printers, removed the drivers from the Print Server and uninstalled the HP software for this printer.

I then attempted to re-install the latest software and drivers (same source as used for initial install). No matter what I did the installation would hang when it asked to plug the printer in via USB.  To confirm this was not a hardware issue with the printer I went through the same steps on a different laptop of the same make with Win 8.1.  On the second PC an un-install and re-install went fine and I was able to print and scan with the same printer.

During a final attempt to install I noticed that when I plugged in the printer (when prompted by the software installer) an External Disk named CM1312 showed up. This "disk" can't be accessed; says it has no media, but it shows up in File Manager as well as in Device Manager (as both a Removable Disk and USB Device).

I suspect that somehow windows got confused and registered this device as a drive and that's why the HP software can't see it being plugged in.  What I can't figure out is how to break this association so that it will be seen as a new device.

Any suggestions?
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BRT-TechAuthor Commented:
I am going to close this question unanswered.  I wasn't able to resolve the problem with the installer, but by killing it with task manager at the screen where it was prompting to plug in the printer It had successfully installed all the drivers.

In order to prevent the installer from rolling back, I had to kill the task, then reboot and kill it again.

Scanning and printing is working again :)

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