Problem

 

Possible cause

 

Solution

 

 

 

 

 

Windows PC only

 

Installation was not

 

Try the following:

When I connected

 

completed, it was

 

1

Disconnect the USB cable from your

a USB cable

 

cancelled, or there

 

 

computer.

between the printer

 

was an error.

 

2

Unplug the power cord from the

and my computer,

 

 

 

 

printer, then plug it in again.

the New Hardware

 

 

 

3

Uninstall the printer software. Insert the

Wizard appeared

 

 

 

 

 

 

 

printer software CD into your computer,

once, but the printer

 

 

 

 

 

 

 

 

click Remove HP Photosmart software,

did not install

 

 

 

 

 

 

 

 

then follow the instructions on your

completely. Now

 

 

 

 

 

 

 

 

computer screen.

the New Hardware

 

 

 

 

 

 

 

4

When the uninstall is completed, restart

Wizard will not

 

 

 

 

 

 

 

your computer.

appear again.

 

 

 

 

 

 

 

5

Reconnect the USB cable to your

 

 

 

 

 

 

 

 

 

computer. Make sure the cable is

 

 

 

 

 

securely attached to the USB port on

 

 

 

 

 

the back of the printer.

 

 

 

 

6

Reinstall the printer software. For

 

 

 

 

 

instructions, see the Software Setup &

 

 

 

 

 

Product Support booklet.

 

 

 

 

 

 

 

 

 

 

 

Windows PC only

 

Static electricity has

 

Try the following:

When I connect a

 

built up in the cable

 

1

Disconnect the USB cable from your

USB cable between

 

between your

 

 

printer.

the printer and my

 

computer and

 

2

Disconnect the power cord from the

computer, an

 

printer.

 

 

printer.

UNKNOWN

 

OR

 

3

Wait approximately 10 seconds.

DEVICE message

 

You may have a

 

 

 

4

Plug the power cord back into the

appears.

 

defective USB

 

 

 

 

printer.

 

 

cable.

 

 

 

 

 

5

Plug the USB cable back into the port

 

 

OR

 

 

 

 

 

on the back of the printer.

 

 

Your USB cable

 

 

 

 

 

6

If UNKNOWN DEVICE continues to

 

 

may not be

 

 

 

 

 

appear in the New Hardware Wizard,

 

 

connected

 

 

 

 

 

 

check www.hp.com for updates or

 

 

properly.

 

 

 

 

 

 

contact HP Support and Services. For

 

 

OR

 

 

 

 

 

 

contact information, see the Software

 

 

The software could

 

 

Setup & Product Support booklet that

 

 

not identify the

 

 

came with your printer.

 

 

printer; the printer-

 

 

 

 

 

USB connection

 

 

 

 

 

may be defective.

 

 

 

 

 

 

 

 

 

34

basics guide

Page 38
Image 38
HP 7550 manual Product Support booklet