This is because you need the Windows 7 driver for your HP OfficeJet j4680.
A Driver is a small piece of software that allows the Operating System (Win7) to 'communicate' with a device.
(HP OfficeJet j4680)
OfficeJet turned off, and unplugged from power. Disconnect the USB cable FROM the computer.
You DO NOT want the printer plugged into the computer before you have installed the software.
With it turned off, and unplugged from power, it will reset.
AFTER the software is installed, and the printer is plugged back into the computer, then plugged back into power, Windows 7 fully loaded, and THEN turned on, Windows will recognize it.
This is HP Support, and the Software and Driver Downloads page,http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?lc=en&dlc=en&cc=us&lang=en&product=3692888&
On this page you will see the heading >
Select your operating system, then click 'Next':
Click on the blue Down Arrow, to the right of the box with Select in it.
In the drop down list click on the Operating System you are using.
I don't know if you are using Windows 7 32-bit, or Windows 7 64-bit.
[The Drivers you are going to download, may be the same for Windows 32-bit, or 64-bit.
64 Bit is backwards compatible with 32-bit.
However this is Not in all cases.
It's better that you use the drivers for THE particular Windows 7 that you have, and avoid any problems}
I'm going to use Windows 7 32-bit for an example.
Click on Next.
In the list click on the + sign to the left of >
In the Drivers list I suggest you choose >
HP OfficeJet Full Feature Software and Driver
At the bottom of the file you will see the heading underlined > More info
Click on More info.
Copy what is stated, or write it out on a piece of paper.
You may find you need this info.
In the blue rectangle that has Download, in white, click on it.
A small window will come up.
Click on Save File.
Another small window will come up on the left.
Write down what is in the top of the window.
This is where the file will download to.
Go to where the file has downloaded to (File name > OJJ4600_Full_13.exe), and Double-click on the file name.
Follow the easy instructions of the Installation Wizard.
(Essentially click on Next, Next, and Finish)
Now close all windows, and go back to your desktop screen.
Plug the printer into the computer with the USB cable.
Plug the printer into power.
Windows fully loaded turn the printer on.