Dell DCT Owner's Manual

www.dell.com | support.dell.comDell™ OptiPlex™ 755Quick Reference GuideModels DCTR, DCNE, DCSM, and DCCY

10 Quick Reference GuideSetting Up Your Computer CAUTION: Before performing any of the procedures in this section, follow the safety instructions in

Quick Reference Guide 113Connect the monitor.Align and gently insert the monitor cable to avoid bending connector pins. Tighten the thumbscrews on the

12 Quick Reference GuideSet Up Your MonitorPower Connections

Quick Reference Guide 13Before You BeginThis chapter provides procedures for removing and installing the components in your computer. Unless otherwise

14 Quick Reference Guide NOTICE: Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not auto

Quick Reference Guide 15 CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover

16 Quick Reference GuideMini Tower ComputerSystem ViewsFront View1 5.25-inch drive bayCan contain an optical drive. Insert a CD or DVD (if supported)

Quick Reference Guide 173 3.5-inch drive bayCan contain an optional floppy drive or optional media card reader.4 USB 2.0 connectors (2)Use the front U

18 Quick Reference Guide8 power light The power light illuminates and blinks or remains solid to indicate different operating modes:• No light — The c

Quick Reference Guide 19Back View1 cover-release latchThis latch allows you to open the computer cover.2 padlock ring Insert a padlock to lock the com

Notes, Notices, and Cautions NOTE: A NOTE indicates important information that helps you make better use of your computer. NOTICE: A NOTICE indicates

20 Quick Reference GuideBack Panel Connectors3 voltage selection switchYour computer is equipped with a manual voltage-selection switch. To help avoid

Quick Reference Guide 212 link integrity light• Green — A good connection exists between a 10-Mbps network and the computer.• Orange — A good connecti

22 Quick Reference GuideRemoving the Computer Cover CAUTION: Before you begin any of the procedures in this section, follow the safety instructions l

Quick Reference Guide 231 security cable slot 2 cover release latch3 padlock ring213

24 Quick Reference GuideInside Your Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located

Quick Reference Guide 25System Board Components235716817189104131122211911514 12206

26 Quick Reference GuideJumper Settings1 speaker connector (INT_SPKR) 12 RTC reset jumper (RTCRST)2 fan (FAN_CPU) 13 intrusion switch connector (INTRU

Quick Reference Guide 27Desktop ComputerSystem ViewsFront ViewRTCRST The real-time clock has not been reset. The real-time clock is being reset (jumpe

28 Quick Reference Guide3 power button Press this button to turn on the computer. NOTICE: To avoid losing data, do not turn off the computer by pressi

Quick Reference Guide 29Back View8 headphone connectorUse the headphone connector to attach headphones and most kinds of speakers.9 microphone connect

Contents 3ContentsFinding Information . . . . . . . . . . . . . . . . . . . . 5Setting Up Your Computer. . . . . . . . . . . . . . . . 10Set Up Yo

30 Quick Reference GuideBack Panel Connectors4 voltage selection switchYour computer is equipped with a manual voltage selection switch. To help avoid

Quick Reference Guide 312 link integrity light• Green — A good connection exists between a 10-Mbps network and the computer.• Orange — A good connecti

32 Quick Reference GuideRemoving the Computer Cover CAUTION: Before you begin any of the procedures in this section, follow the safety instructions i

Quick Reference Guide 33Inside Your Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the P

34 Quick Reference Guide1 drive bays (media card reader or floppy drive, optical drive and hard drive) 2 power supply3 optional chassis-intrusion swit

Quick Reference Guide 35System Board Components12415168111231820172214659101319721

36 Quick Reference GuideJumper Settings1 internal speaker (INT_SPKR) 12 intrusion switch connector (INTRUDER)2 processor connector (CPU) 13 battery so

Quick Reference Guide 37Small Form Factor ComputerSystem ViewsFront ViewRTCRST The real-time clock has not been reset. The real-time clock is being re

38 Quick Reference Guide2 power button Press to turn on the computer. NOTICE: To avoid losing data, do not turn off the computer by pressing the power

Quick Reference Guide 397 power light The power light illuminates and blinks or remains solid to indicate different operating states:• No light — The

4 ContentsInside Your Computer . . . . . . . . . . . . . . . . 44System Board Components. . . . . . . . . . . . . 46Jumper Settings . . . . . . .

40 Quick Reference GuideBack View1 card slots (2) Access connectors for any installed PCI cards, PCI Express cards, PS/2, eSATA, and so on.2 back pane

Quick Reference Guide 41Back Panel Connectors1 parallel connector Connect a parallel device, such as a printer, to the parallel connector. If you have

42 Quick Reference Guide3 network adapter connectorTo attach your computer to a network or broadband device, connect one end of a network cable to eit

Quick Reference Guide 43Removing the Computer Cover CAUTION: Before you begin any of the procedures in this section, follow the safety instructions i

44 Quick Reference GuideInside Your Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the P

Quick Reference Guide 451 drive-release latch 2 optical drive3 power supply 4 hard drive5 system board 6 heat sink assembly345612

46 Quick Reference GuideSystem Board Components12451661983712 1020172115149111813

Quick Reference Guide 47Jumper Settings1 internal speaker connector (INT_SPKR)12 RTC reset jumper (RTCRST)2 processor connector (CPU) 13 intrusion swi

48 Quick Reference GuideUltra Small Form Factor ComputerSystem Views NOTICE: Do not place your monitor on the computer. Use a monitor stand. NOTICE:

Quick Reference Guide 491 USB connectors (2)Use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or f

Quick Reference Guide 5Finding Information NOTE: Some features or media may be optional and may not ship with your computer. Some features or media m

50 Quick Reference GuideSide View8 hard drive access lightThe hard drive access light is on when the computer reads data from or writes data to the ha

Quick Reference Guide 51Back View1 diagnostic lights See "Diagnostic Lights" on page 66 for a description of light codes that can help you t

52 Quick Reference GuideBack Panel Connectors1 parallel connectorConnect a parallel device, such as a printer, to the parallel connector. If you have

Quick Reference Guide 53Connecting a VGA MonitorIf you have a VGA monitor, plug the adapter cable into the white DVI video connector on the back panel

54 Quick Reference GuideConnecting Two MonitorsUse the cable adapter to connect a VGA monitor and a DVI monitor to the DVI-I connector on the back pan

Quick Reference Guide 55When you connect two monitors, the video driver will detect this connection and activate the multimonitor functionality.Removi

56 Quick Reference GuideInside Your Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the P

Quick Reference Guide 57Cable Cover (Optional)Attaching the Cable Cover1Ensure that all external device cables are threaded through the hole in the ca

58 Quick Reference GuideRemoving the Cable Cover1If a security device is installed in the security cable slot, remove the device.2Slide the release bu

Quick Reference Guide 59System Board Components1234131478116591210

6 Quick Reference Guide• How to set up my computer• How to run the Dell Diagnostics• Error codes and diagnostic lights• Tools and utilities • How to s

60 Quick Reference GuideJumper Settings1 fan connector (FAN_FRONT) 8 password jumper (PSWD)2 internal speaker connector (INT_SPKR)9 hard drive fan con

Quick Reference Guide 61Solving ProblemsDell provides a number of tools to help you if your computer does not perform as expected. For the latest trou

62 Quick Reference GuideStart the Dell Diagnostics from either your hard drive or from the Drivers and Utilities media (an optional CD). See "Sta

Quick Reference Guide 63Starting the Dell Diagnostics From the Drivers and Utilities CD (Optional)1Insert the Drivers and Utilities CD (optional).2Shu

64 Quick Reference Guide2If a problem is encountered during a test, a message appears with an error code and a description of the problem. Write down

Quick Reference Guide 654When the tests are completed, if you are running the Dell Diagnostics from the Drivers and Utilities CD, remove the CD.5When

66 Quick Reference GuideDiagnostic Lights CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Prod

Quick Reference Guide 67Power Light Problem Description Suggested ResolutionThe computer is in a normal off condition or a possible pre-BIOS failure h

68 Quick Reference GuideA possible graphics card failure has occurred.• Reseat any installed graphics cards (see the "Cards" information for

Quick Reference Guide 69Memory modules are detected, but a memory configuration or compatibility error has occurred.• Ensure that no special requireme

Quick Reference Guide 7• Service Tag and Express Service Code • Microsoft Windows License LabelService Tag and Microsoft® Windows® LicenseThese labels

70 Quick Reference GuideBeep CodesYour computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This se

Quick Reference Guide 71If you experience any of the following beep code errors, see "Contacting Dell" in the User’s Guide for instructions

72 Quick Reference GuideResolving Software and Hardware IncompatibilitiesIf a device is either not detected during the operating system setup or is de

Quick Reference Guide 73Restoring Your Operating SystemYou can restore your operating system in the following ways:• System Restore returns your compu

74 Quick Reference GuideStarting System RestoreWindows XP: NOTICE: Before you restore the computer to an earlier operating state, save and close any

Quick Reference Guide 75Enabling System Restore NOTE: Windows Vista does not disable System Restore; regardless of low disk space. Therefore, the ste

76 Quick Reference Guide2Immediately upon seeing the blue bar, press <Ctrl><F11>.If you do not press <Ctrl><F11> in time, let

Quick Reference Guide 773Double-click the filename DSRIRRemv2.exe. NOTE: If you do not log on as a local administrator, a message appears stating tha

78 Quick Reference Guide6Click Next.The Confirm Data Deletion screen appears. NOTICE: If you do not want to proceed with Factory Image Restore, clic

Quick Reference Guide 79Microsoft Windows Vista™1Click the Windows Vista start button , and right-click Computer.2Click Properties→ Device Manager. N

8 Quick Reference Guide• Solutions — Troubleshooting hints and tips, articles from technicians, and online courses, frequently asked questions• Commun

80 Quick Reference Guide3Right-click the device for which the new driver was installed and click Properties.4Click the Drivers tab→ Roll Back Driver.I

Quick Reference Guide 815Click the Driver tab→ Update Driver→ Browse my computer for driver software.6Click Browse and browse to the location to which

Quick Reference Guide 9• How to use Windows XP• How to work with programs and files• How to personalize my desktopWindows Help and Support Center1To a