HP DeskJet 840c

Hi I think your printer has a parallel connector ( big D shaped socket with wire clips each end) on it if your pc also has a parallel plug get a parallel lead and install the drivers to use LPT1 this should remove the faulty USB plug from the problem
good luck Ian

Hello,

They do make adater cables for such problems. Here is just one such example: Parallel to USB Cable

Make sure you get the correct 25 pin cable. They have this type also:

Parallel to USB Cable 2

You can search the web for more companies. Google parallel to usb printer cable.

After saying all that and checking your printer info, I see that the 840c has both a parallel and a USB cable port. See page 21 of the manual: HP 840c Manual

If you go that route, you will need a standard USB cable. The shorter the better, but no longer than a 6' cable. Make sure you follow the iinstallation instructions for the USB setup in the manual.

Thanks for using Fixya.

what andrew said worked. I additionally reinstalled the drivers.

well writen- if all is as you say that just leaves the drivers for your printer...
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?lc=en&dlc=en&cc=us&lang=en&product=59868&
go to this page and select your operating system (win XP- Vistia) then save the drivers to desktop.
Now- disconnect your printer from your computer and don't reconnect until you are instructed to do so. OK-run your printer drivers and follow directions-connect when told to-
And that should do it.
Please leave for me a rating...

reboot the computer and the printer..
then try to do a "Print Test Page"..if it still does not print, turn off the computer again, unplug the printer from the back of the computer ( I assume it's connected via USB), then plug the printer on a different usb slot on the computer.. you may have to re-install the drivers. make sure you have the cd for the printer.

Hope this helps.

test page printing but doc files not printing....

HP DeskJet 6940

try to uninstall the printer and the port say(usb,paralell) then restat yr system n reinstall the printer. try printing from the printer test page if it prints well then yr problem should be from the package ur using may u uninstall n reinstall as well
thanks

I did see you reinstalled your software) but please continue
It is important that you have that icon by the clock. Power off the printer by pressing the power button on the printer.
Please un-install your printer software through Add/Remove Programs within the control panel. Please restart the Pc after un-install is complete. Create a folder on your hard drive and name it, "HP DeskJet 840C". Go to this link listed below & download the printer driver software listed. When you save to disk you can choose where you want to save. Pick the folder you created. Save inside this folder. The HP driver (Will most likely be updated software). I promise, you will have a icon down by your clock when finished.
http://h10025.www1.hp.com/ewfrf/wc/product?product=59868&lc=en&cc=us&dlc=en&submit.y=4&submit.x=7&lang=en&cc=us
Follow the instruction in your manual for setup & installation.
If you using Outlook Express & you want to print or send through your printer the page should be set as 8.5x11". Orientation should be set to Portrait, unless you set this for A4.
Lastly, please turn off your anti-virus software during install & re-install. Just in case you come back to this thread!
please vote...

try replacing the ink cartridges

In your print utility, you need to calibrate your printer, which will print a test page and realign your cartridges. It should be OK after this. If not restart the printer and the computer.