Both my printer lights are flashing and I have tried all the

Hi ginnyjaye,
I suggest if you have some CD of printer driver, plaese re install it.

Try using the HP Print Diagnostic Utility in Windows - HP Customer Care (United States - English).

If you need more help come back.Post / thumbs / testimonial are welcome!

my LABLE printer( QL420 PLUS) lost its network connections

This is typical cartridge problem.Which cartridge changed?This printer can print with the only one cartridge inside it, whatever which.Try this: Open cover put out color cartridge then close cover.If blinking stops replace color cartridge.If blinking continues put out black cartridge and put in color.If blinking stops replace black cartridge, if not stop replace both cartridges.
If this not help your printer has problem in carriage unit and need repair.

1) Close the print head cover, and turn off the printer. While pressing the Resume/Cancel button, press the Power button. (Do not release the buttons. The LED lights in green to indicate that a function is selectable.) 2) While holding the Power button, release the Resume/Cancel button. (Do not release the Power button.) 3) While holding the Power button, press the Resume/Cancel button 3 times, and then release the Power and Resume/Cancel buttons. 4) When the LED stops blinking and lights in green, press the Resume/Cancel button 4 times. Finally press the Power button.

follow the link this is from hp on problems with 5550 using vista and how to fix it.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00843712&lc=en&dlc=en&cc=us&lang=en&product=71896
Mark

Here is a page explaining how to resolve this issue:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=71895&prodTypeId=18972&prodSeriesId=71895&objectID=c00681585

Hi all of you
your problem sound as you have hanged Button, try clean it and refit it.
thanks,

Hamedo

Hi all of you ,
Since the cartridge drive not stop in center when open the to door, you have ffurther problem
try use the old one, if ok , clean your printer.
thanks

Hamedo

Hello,

Here you will find steps for troubleshooting a carriage that wont move. Also, you can find information about the blinking lights here.

Hope this helps. Please remember to rate this information.

Thanks