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3. Slide the power supply toward the front of the computer approximately 1 inch. 4. Lift the power supply up and out of the computer. Small Desktop Computer 1. 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 frame 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. 2. Remove the expansion-card cage and remove the power cables from the side of the hard drive. To remove the power cables, use the cables as leverage and pull away from the clips while you pull on the metal clips with your fingers. 3. Press down on the handle, which in turn presses the release button. 4. Slide the power supply toward the front of the computer approximately 1 inch. 5. Lift the power supply up and out of the computer. Small Mini-Tower Computer 1. 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 frame 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. 2. Remove the two screws that attach the power supply to the back of the computer frame. 3. Press the release button located on the floor of the computer frame. 1 release button 2 AC power connector 1 release button 2 handle 3 AC power connector 4. Slide the power supply toward the front of the computer approximately 1 inch. 5. Lift the power supply up and out of the computer. Replacing the Power Supply 1. Slide the power supply into place. 2. On the small mini-tower computer, replace the two screws that secure the power supply to the back of the computer frame. 3. Reconnect the DC power cables. 4. Connect the AC power cable to the connector. 5. On the small desktop computer, reattach the power cables to the side of the hard drive and replace the expansion-card cage. 6. Run the cables underneath the clips, and press the clips to close them over the cables. 7. Close the computer cover. 8. Attach the computer stand, if it is used. 9. 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 it into the computer. Back to Contents Page System Board Dell™ OptiPlex™ GX270 Service Manual Small Form-Factor System Board Small Desktop System Board 1 floppy-drive connector (DSKT) 11 CD drive audio cable connector (CD_IN) 2 CD/DVD drive connector (IDE2) 12 front-panel audio cable connector (FRONTAUDIO) 3 battery socket (BATTERY) 13 power connector (12VPOWER) 4 front-panel connector (FRONTPANEL) 14 serial port connector (SER2) for optional serial port cards 5 IDE hard-drive connector (IDE1) 15 microprocessor and heat sink connector (CPU) 6 serial ATA hard-drive connector (SATA1) 16 microprocessor fan connector (FAN) 7 internal speaker (SPEAKER) 17 memory module connectors (DIMM_1 and DIMM_2) 8 standby power light (AUX_PWR) 18 power connector (POWER) 9 AGP card connector (AGP) 19 RTC reset jumper (RTCRST) 10 PCI card connector 20 password jumper (PSWD) Small Mini-Tower System Board 1 floppy-drive connector (DSKT) 11 CD drive audio cable connector (CD_IN) 2 CD/DVD drive connector (IDE2) 12 front-panel audio cable connector (FRONTAUDIO) 3 battery socket (BATTERY) 13 power connector (12VPOWER) 4 front-panel connector (FRONTPANEL) 14 serial port connector (SER2) for optional serial port cards 5 IDE hard-drive connector (IDE1) 15 microprocessor and heat sink connector (CPU) 6 serial ATA hard-drive connector (SATA1) 16 microprocessor fan connector (FAN) 7 internal speaker (SPEAKER) 17 memory module connectors (DIMMs 1, 3, 2, and 4) 8 standby power light (AUX_PWR) 18 power connector (POWER) 9 AGP card connector (AGP) 19 RTC reset jumper (RTCRST) 10 PCI riser board connector (PCI2) 20 password jumper (PSWD) Jumper Settings Resetting CMOS Settings 1 floppy-drive connector (DSKT) 12 CD drive audio cable connector (CD_IN) 2 CD/DVD drive connector (IDE2) 13 front-panel audio cable connector (FRONTAUDIO) 3 battery socket (BATTERY) 14 power connector (12VPOWER) 4 front-panel connector (FRONTPANEL) 15 serial port connector (SER2) for optional serial port cards 5 IDE hard-drive connector (IDE1) 16 microprocessor and heat sink connector (CPU) 6 serial ATA hard-drive connector (SATA2) 17 microprocessor fan connector (FAN) 7 serial ATA hard-drive connector (SATA1) 18 memory module connectors (DIMMs 1, 3, 2, and 4) 8 internal speaker (SPEAKER) 19 power connector (POWER) 9 standby power light (AUX_PWR) 20 RTC reset jumper (RTCRST) 10 AGP card connector (AGP) 21 password jumper (PSWD) 11 PCI connectors (PCI 1, 2, 3, and 4)) Jumper Setting Description PSWD (default) Password features are enabled. Password features are disabled. RTCRST Real-time clock reset. jumpered unjumpered CAUTION: Before yo...