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3. Replace the computer cover. 4. Connect your computer and monitor to electrical outlets, and turn them on. 5. After the Microsoft® Windows® desktop appears on your computer, shut down the computer. 6. Turn off the monitor and disconnect it from the electrical outlet. 7. Disconnect the computer power cable from the electrical outlet, and press the power button to ground the system board. 8. Open the computer cover. 9. Locate the 3-pin password jumper (PSWD) on the system board and attach the jumper to pins 1 and 2 to reenable the password feature. 10. Replace the computer cover. 11. Connect your computer and devices to electrical outlets, and turn them on. Clearing CMOS Settings NOTE: Write down your current boot sequence in case you want to restore it. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTE: When you receive your computer, the jumper plug is attached to pin 1. NOTICE: To connect a network cable, first plug the cable into the network device and then plug the cable into the computer. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. 1. Follow the procedures in "Before You Begin." 2. Reset the current CMOS settings: a. Locate the 3-pin CMOS jumper (RTCRST) on the system board. b. Remove the jumper plug from pins 2 and 3. c. Place the jumper plug on pins 1 and 2 and wait approximately five seconds. d. Replace the jumper plug on pins 2 and 3. 3. Replace the computer cover. 4. Connect your computer and devices to electrical outlets, and turn them on. Back to Contents Page NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug the cable into the computer. Back to Contents Page Technical Overview Inside View of Your Computer System Board Components Power Supply DC Connector Pin Assignments Inside View of Your Computer System Board Components 1 drives bay (CD/DVD, floppy, and hard drive) 2 power supply 3 system board 4 card slots 5 heat sink assembly 6 front I/O panel 1 fan connector (FAN) 2 processor connector (CPU) 3 power connector (12VPOWER) 4 memory module connectors 5 serial ATA drive 6 front-panel connector Jumper Settings The jumper locations are shown below. Power Supply DC Connector Pin Assignments 1. Follow the procedures in "Before You Begin." 2. Disconnect the DC power cables from the system board and the drives. Note the routing of the DC power cables underneath the tabs in the computer chassis as you remove them from the system board and drives. You must route these cables properly when you replace them to prevent their being pinched or crimped. 3. Remove the two screws that attach the power supply to the back of the computer chassis. 4. Remove the CD/DVD drive and carefully set it aside. 5. Press the release button located on the floor of the computer chassis. (DIMM_1, DIMM_2) connector (SATA0) (FNT_PANEL) 7 power connector (POWER) 8 CD/DVD drive connector (IDE) 9 PCI Express x1 card connector 10 PCI card connector (2) 11 FlexBay USB connector 12 piezo buzzer 13 password jumper (PSWD) 14 floppy drive connector (DSKT) 15 battery socket (BATT) 16 RTC reset jumper (RTCRST) Jumper Setting Description PSWD Password features are enabled (default). Password features are disabled. RTCRST The real-time clock is in normal operating mode. The real-time clock is being reset (jumpered temporarily). jumpered unjumpered 6. Slide the power supply toward the front of the computer by approximately 1 inch. 7. Lift the power supply up and out of the computer. 8. Slide the replacement power supply into place. 9. Replace the screws that secure the power supply to the back of the computer chassis. 10. Reconnect the DC power cables. 11. Replace the CD/DVD drive. 12. Connect the AC power cable to the connector. 13. Replace the computer cover. DC Power Connectors 1 release button 2 power supply 3 screws (2) 4 AC power connector DC Power Connector P1 DC Power Connector P2 DC Power Connector P3 Pin Number Signal name 18-AWG Wire 1 +3.3 VDC Orange 2 +3.3 VDC Orange 3 GND Black 4 +5 VDC Red 5 GND Black 6 +5 VDC Red 7 GND Black 8 PS_PWROK* Gray 9 P5AUX Purple 10 +12 VDC White 11 +12 VDC White 12 +3.3 VDC Orange 13 +3.3 VDC Orange 14 -12 VDC* Blue 15 GND Black 16 PWR_PS_ON* Green 17 GND Black 18 GND Black 19 GND Black 20 NC N/C 21 +5 VDC Red 22 +5 VDC Red 23 +5 VDC Red 24 GND Black *Uses 22-AWG wire instead of 18-AWG wire. Pin Number Signal Name 18-AWG Wire 1 GND Black 2 GND Black 3 +12 VDC Yellow 4 +12 VDC Yellow DC Power Connector P4 DC Power Connector P5 Back to Contents Page Pin Number Signal name 18-AWG Wire 1 +12 VDC Yellow 2 GND Black 3 GND Black 4 +5 VDC Red Pin Number Signal Name 22-AWG Wire 1 +5 VCD Red 2 GND Black 3 GND Black 4 +12 VDC Yellow Pin Number Signal name 18-AWG Wire 1 +3.3 VDC Orange 2 COM Black 3 +5 VDC Red 4 GND Black 5 +12 VDC Yellow Back to Contents Page Dell™ Dimension™ 31...