Possible causes of a lost connection are:
•The computer might not be connected to the printer, the printer might be off, or the printer might not be connected to a power source.
•You might be using a USB hub or docking station that has multiple devices connected to it. Accessing another device can temporarily break the connection to the printer. Wait until the other device is no longer being accessed, or connect the printer directly to the computer.
Whenever a connection is broken, the Windows taskbar
displays this icon: 
.
To reconnect, try the following:
•Make sure the USB cable is securely attached to both the computer and to the USB port on the back of the printer.
•Make sure that the printer’s power cord is securely attached, that the printer is connected to a power source, and that it is turned on.
•If the connection is still broken,
If an HP Photosmart dialog box appears, click Retry to try to
Macintosh connection problems
If you are using your HP Photosmart printer with a Macintosh computer, the printer requires a continuous connection to the computer. The computer uses this communication link to receive feedback from the printer.
If the connection between your Macintosh computer and your HP Photosmart printer is lost, a warning message appears on your computer screen.
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