Dell OptiPlex 755 - Manual (Page 205)

l For the desktop, see Power Supply
l For the small form factor, see Power Supply
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
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
Contacting Dell ).
¡ If the test LED does not illuminate, the power supply is defective. Replace the power supply or contact Dell (see Contacting Dell ).
Printer Problems
Check the printer documentation — See the printer documentation for setup and troubleshooting information.
Ensure that the printer is turned on
Check the printer cable connections —
l See the printer documentation for cable connection information.
l Ensure that the printer cables are securely connected to the printer and the computer.
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
Check the scanner documentation — See the scanner documentation for setup and troubleshooting information.
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 —
l See the scanner documentation for information on cable connections.
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.
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.