HP Deskjet 450 Mobile Printer series - Manual (Page 56)

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Solving printing problems
This section provides solutions to common printing problems.
If none of the following solutions work, the problem is likely caused by the
inability of the software program to properly interpret print settings. Check the
release notes on the Starter CD for known software conflicts. Otherwise, check
your software program manual, or call the software manufacturer for more
specific help with the problem.
A blank page is printed
Check for empty print cartridges
If you are printing black text and a blank page prints, your black print
cartridge might be empty. For information about replacing print cartridges,
see
Replacing the print cartridges .
Check the printer selection
For Windows, make sure your printer is selected as the current or default
printer. Click
Start > Settings > Printers to open the Printers folder. In the
Printers folder, right-click the printer icon and click Set As Default Printer
in the pop-up menu.
For Macintosh, see Printing from Macintosh .
Check the parallel or USB port on your computer
If you are using a parallel or USB cable, make sure your printer is
connected directly to the port. Do not share the port with other devices,
such as a Zip drive.
Meaningless characters are printed
Check the cable connection
A common cause for meaningless characters is a poor cable connection
between the printer and computer. Make sure the cable connection at both
ends is good and that the cable is securely fastened.
If cables are secure and the problem persists, press the P OWER BUTTON to
turn off the printer and disconnect the USB or parallel cable from the
printer. Turn the printer back on without the connection in place. When the
Power LED remains green, reconnect the USB or parallel cable.
Check the wireless connection
If your wireless connection is disconnected and then reconnected,
meaningless characters will print. Resend the print job.