HP 2600/2700 - Manual (Page 174)

I connected the USB cable, but I am having problems using the HP all-in-one with
my computer
Solution
You must first install the software that came with your HP all-in-one before
connecting the USB cable. During installation, do not plug in the USB cable until
prompted by the onscreen instructions. Connecting the USB cable before prompted
can cause errors.
Once you have installed the software, connecting your computer to your HP all-in-
one with a USB cable is straightforward. Simply plug one end of the USB cable into
the back of your computer and the other into the back of the HP all-in-one. You can
connect to any USB port on the back of your computer.
I received a message on the color graphics display to attach the control panel
overlay
Solution
This might mean the control panel overlay is not attached, or it is attached
incorrectly. Make sure to align the overlay over the buttons on the top of the
HP all-in-one and snap it firmly into place.
User Guide 171
Troubleshooting
information