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What cable do i need to connect HPdeskjet 840c to my laptop Compaq cq71-140ea.

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Your HP printer model has two interfaces, Parallel and USB.

Your Compaq laptop does not have a parallel printer port, but does have three USB ports.

USB is definitely the way to go. Obtain a USB cable (version 2.0, not 1.1) from Best Buy, Fry's Electronics, Radio Shack, Office Max/Depot. ($10 ~ $20) Try to keep the USB cable length at six feet or shorter, for best performance.

Posted on Oct 07, 2009


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My new computer does not have a parallel printer port. My old 840C printer has both parallel and USB ports, though I only ever used it with a parallel cable, so I tried connecting with a USB cable. The...

Hello and welcome draepeacock !
The only solution is a workaround :
If you have the W XP install disc , you can install a virtual version of W XP on your machine from
If you still have the install disc , you can also partition your primary and install W XP on the new partition from up your data first.

Both are easy and safe , no specific knowledge required .
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The Deskjet 840c driver is included in the Win7 OS. You need to use Windows Update. Connect the data cable to the computer. Windows 7 should find the driver. If it doesn't, open Windows Update and check for updates. Look under Optional Updates.

If it still doesn't properly install the printer, disconnect the USB cable and then turn the printer off and then on again. Then open the Devices and Printers window and remove the printer (right click and choose Remove device). Remove all icons for the 840c if you have multiple in the control panel. Then reboot the computer and make sure your network connection is active. Reopen the Devices and Printers window and install the printer manually. To do this: click on Add a printer, choose Add a local printer then click Use an existing port. Select LPT1: (Printer Port) in the dropdown menu and click Next. Click on the Windows Update button and wait for the updates to be completed. Choose HP as the manufacturer and the Deskjet 800 series. Now connect the USB cable between the printer and the computer. You should see the installing device driver software window. Wait until the window disappears and then click Cancel on the Add a Printer Window.

If problems persist, try a new data cable. Try directly connecting to the computer if you are using a print server or USB hub. Make sure the computer USB ports are working. The ports can be disabled for security or power savings. (Check in the Device Manager (Start > Control Panel > System and Security > System > Device Manager) or from the advanced settings for the Screen Saver (right click on the desktop anywhere there are no icons or running programs, select Personalize and then click on the Screen Saver icon. then click on Change Power Settings and Change Plan Settings for the active plan).

I hope this helps.

Cindy Wells

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1 Answer



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.

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  • Win 98 software version will never support Win XP system. Please download the software for your XP machine via the below link.

  • Save the download the file to your desktop.
  • Uninstall the older version, restart the computer and install the new version from downloaded file.
Thanks & Regards

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HP DeskJet 840c

pls. change your data cable of printer connected to computer

if it is work pls. remarks

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