HP 910 manual Solution To resolve the problem, Unknown Device message displays

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Solution:

To resolve the problem

1.Make sure that no USB devices other than the printer, the keyboard, and the mouse are connected to the computer.

2.Disconnect and reconnect the USB cable.

3.Make sure that the printer is connected directly to a USB port on the computer (instead of through a USB hub).

4.If the installation program still does not locate the printer, replace the USB cable, and then continue to the next step.

5.Click Cancel, and then restart the computer.

6.Turn the printer off, and then disconnect the USB cable and power cord.

7.Quit any antivirus programs or other software programs that are running on the computer.

NOTE: To quit an antivirus program, follow the manufacturer’s instructions.

8.Reinstall the printer software:

a. Insert the printer software CD into the drive.

b. Follow the onscreen instructions. When the installation program prompts you, connect the USB cable and the power cord to the printer, and then make sure that the printer is on.

NOTE: Do not connect the USB cable until you are told to do so.

c. Follow the onscreen instructions to finish the installation.

9.Restart the antivirus program.

"Unknown Device" message displays

Cause: During installation, an “Unknown Device” message might be displayed when you connect a USB cable between the printer and the computer. A possible cause might be a defective USB cable.

Solution:

NOTE: This is not a problem if you are using Windows 2000. If you are using Windows 2000 and this message is displayed, you can continue with the software installation.

To resolve the problem

1.Disconnect the USB cable from the printer.

2.Disconnect the power cord from the printer.

3.Wait approximately 30 seconds.

4.Reconnect the power cord to the printer.

5.Reconnect the USB cable to the printer.

6.If the “Unknown Device” message is still displayed, replace the USB cable.

Installation problems

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Troubleshooting

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Contents HP 910 Printer Visual AccessibilityHewlett-Packard Company notices AcknowledgementsContents Printer software MaintenanceTroubleshooting Printing tipsTechnical information HP supportIndex Section WelcomeChapter Special features Printer at a glance Get startedButtons and lights Power button and light Paper trays Cancel buttonTo unfold the paper trays Unfold the paper traysInput tray Output tray Paper guideTo fold the paper trays Fold the paper traysGet started Replace print cartridges Print cartridgesUse print cartridges To remove plastic tape from a print cartridge Ink-backup modeExit ink-backup mode Ink-backup mode outputConnect the printer Print borderless photos Print photosOrientation Portrait or Landscape PrintPrint photos with a border Click the Printing Shortcuts tab Photo print cartridge To change the HP Real Life Technologies settingHP Real Life Technologies photo fix To use the photo print cartridge To install the photo print cartridgeExif Print Store and handle photo paperHandling Save money when printing photosStorage Print e-mail Print other documentsPrint documents Print letters Print letters Print envelopes Print postcards Print index cards and other small media Print labels Print CD/DVD tattoos Print transparencies Print brochures Greeting cards Print greeting cardsTwo-sided printing Manual Print Quality Normal Print bookletsLeft Edge Booklet Right Edge Booklet Print posters Paper Type Plain paper Orientation Portrait or Landscape Print iron-on transfersClick Printer Features, and then set Mirror Image to On Printing shortcuts Printing tipsPrint a test To create a printing shortcut Set the page orderCreate printing shortcuts Use printing shortcutsPrint in grayscale Fast/Economical printingPrint multiple pages on a single sheet of paper Print preview Two-sided printingGeneral Everyday printing To define a custom paper size Set a custom paper sizeSelect a paper type Change the print speed or qualityMaximum dpi Print resolutionPrint quality settings To view the print resolutionBound two-sided documents Resize a documentPortrait Presentation printingPrinter software Make the HP Printer the default printerSet default print settings To open the Printer Properties dialog box To change the default print settingsPrinter Properties dialog box Ink Status window Whats This? helpDownload HP Photosmart Software Download printer software updatesTo download a printer software update Selection numbers MaintenanceInstall print cartridges Print cartridge combinationsPrinting with one print cartridge Installation instructionsTo install a print cartridge Slide the print cartridge out of the cradle Align print cartridges Calibrate color Automatically clean print cartridgesClick the Estimated Ink Level tab View estimated ink levelsMaintain the printer body Remove ink from your skin and clothingTo manually clean print cartridge contacts Manually clean print cartridgesTo prepare to clean Print cartridge protector Maintain print cartridgesPrint cartridge storage and handling To open the printer Toolbox Printer ToolboxTo order print cartridges from your desktop Shop for ink suppliesPrint cartridge error messages TroubleshootingError messages Installation program stops Installation problemsOther error messages Unknown Device message displays Solution To resolve the problemPrinter name does not appear Power light is on or flashingTo reinstall the printer software What the flashing light means If an error message appearsIf no error message appears Printer does not printClear the print queue Check the printer cable connectionIf the printer still does not print To stop and restart the print servicePrinter is stalled Document prints slowly Click the Estimated Ink Levels tab Print cartridge problemsSolution To verify and install the correct print cartridges Incorrect or missing print cartridgeLow on ink Print cartridge is faulty or not installed properlyPrint cartridge is in the wrong slot message Printing in ink-backup mode message Paper problemsTo clear a paper jam Paper jamPrinter does not feed paper Out-of-paper messagePrinter prints on multiple sheets at once Check the printer properties Problems with borderless documentsPhotos do not print correctly Check the paper trayPhoto has an unwanted border Image is printed at an angleFading occurs on the edges of a photo For small photo paper with a tear-off tab For small photo paperPrints are faded SolutionPrint quality is poor Faded prints with ink streaksBlank pages print Document is misprintedDocument is printed off-center or at an angle If you continue to have problemsDocument does not reflect the new print settings Text and images are misalignedHP support Ink cartridge warranty informationAfter the phone support period Phone support period Placing a callTechnical information Printer specificationsRecycling program Material safety data sheetsPaper use PlasticsRegulatory notices FCC statement LED indicator statementTechnical information HP 910 Printer declaration of conformity Index IndexIndex USB