Printer Problems; Scanner Problems - Dell OptiPlex 755 User Manual

For the desktop, see
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For the small form factor, see
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3. Connect your computer to a working electrical outlet.
4. Press and hold the power supply test button.
If the test LED illuminates, the power supply is functioning properly. Connect the DC power supply connector to the system board, and then
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perform the test again. Continue to connect devices (one at a time) and perform the self-test until the test LED fails to illuminate and a faulty
device is identified. Replace the defective device/part or contact Dell (see
If the test LED does not illuminate, the power supply is defective. Replace the power supply or contact Dell (see
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Printer Problems

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTE: If you need technical assistance for your printer, contact the printer's manufacturer.
Check the printer documentation —
Ensure that the printer is turned on
Check the printer cable connections —
See the printer documentation for cable connection information.
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Ensure that the printer cables are securely connected to the printer and the computer.
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Test the electrical outlet — Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
Verify that the printer is recognized by Windows —
Windows XP:
1. Click Start® Control Panel® Printers and Other Hardware® View installed printers or fax printers.
2. If the printer is listed, right-click the printer icon.
3. Click Properties® Ports. For a parallel printer, ensure that the Print to the following port(s): setting is LPT1 (Printer Port). For a USB printer, ensure
that the Print to the following port(s): setting is USB.
Windows Vista:
1. Click Start ® Control Panel® Hardware and Sound® Printer.
2. If the printer is listed, right-click the printer icon.
3. Click Properties and click Ports.
4. Adjust the settings, as needed.
Reinstall the printer driver —
See the printer documentation for information on reinstalling the printer driver. —

Scanner Problems

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTE: If you need technical assistance for your scanner, contact the scanner's manufacturer.
Check the scanner documentation —
Unlock the scanner — Ensure that your scanner is unlocked (if the scanner has a locking tab or button).
Restart the computer and try the scanner again
Check the cable connections —
See the scanner documentation for information on cable connections.
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Power Supply
Power Supply
See the printer documentation for setup and troubleshooting information.
See the scanner documentation for setup and troubleshooting information.
Contacting Dell).
Contacting Dell).