HP Deskjet 450 Mobile Printer series - Manual (Page 53)

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If your printer does not turn on, make sure that the power cord and power
adapter are firmly connected to the printer and that the power cord is
connected from your printer to a working outlet.
Try turning the printer off and then on again. If this does not solve the
problem, turn off the printer, unplug the power adapter from the printer, wait
a few seconds, and reconnect the power.
If you still cannot turn the printer on, you might have a faulty power cord.
Unplug the printer and call HP Customer Support. For information about
contacting HP, see
Customer Support .
If you are using battery power, check the Power LED to make sure the
battery power is not low:
• Lights up in green when 41-100% charged
• Lights up in amber when 10-40% charged
• Lights up in red when less than 10% charged
For more information, see Charging and using the battery .
Check the front access cover
Make sure the front access cover is closed.
Check the printer setup
Ensure that the correct port is selected and that the printer is connected
directly to your computer.
Make sure the USB or parallel cable is connected firmly to the printer and
the computer. Check that only one cable is connected. Do not connect
more than one interface cable (parallel or USB) to the printer at the same
time. If two cables are connected, turn off the printer and disconnect the
cable you are not using.
For Windows, check to make sure Pause Printing is not selected. Click
Start > Settings > Printers . In the Printers folder, right-click the printer
icon. If Pause Printing is checked in the drop-down menu, click it to
deselect it.
For Macintosh, check to make sure Stop Print Queue in the Mac
desktop’s Printing menu is not selected.
Check to make sure your printer is selected as the current or default
printer. The default printer is the one that is used if you choose the
Print
command without first specifying which printer you want to use with an
application. The default printer should be the printer that you use most
often.
For Windows, if the printer selection is a problem, click
Start > Settings > Printers . 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 .
If you tried to print when the printer was off, an alert message should have
appeared on your computer screen. If the printer was off and you did not see a
message when you tried to print, the printer setup might be incorrect. To correct
this, reinstall the software that came with your printer.