Dell OptiPlex GX400 User Manual Page 32
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a. Remove the film covering the thermal grease on the bottom of the heat sink.
b. Lower the heat sink to the microprocessor so that the heat sink fits in the heat sink retention base.
c. For each of the replacement metal clips that secure the heat sink to the microprocessor, fit the end of the clip that does not have the latch to the
heat sink retention base. Then press down on the clip's latch to secure the clip to the heat sink retention base (see "Removing the Microprocessor
Heat Sink").
9. Replace the airflow shroud.
10. Rotate the power supply back into position, making sure that the securing tab snaps into place.
11. Replace the computer cover, reconnect the computer and peripherals to their electrical outlets, and turn them on.
ALERT! Cover was previously removed.
12. Enter system setup, and confirm that the top line in the System Data area correctly identifies the new microprocessor. Also, confirm that the values
under the CPU Information menu are correct for the new microprocessor.
13. Exit system setup, and then run the Dell Diagnostics to verify that the new microprocessor is operating properly.
VRM
The voltage regulator module (VRM) senses the microprocessor's voltage requirements and ensures that the correct voltage is maintained.
Removing the VRM
1. Turn off the computer and peripherals, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover.
2. Rotate the power supply away from the system board.
3. Remove the VRM securing clip:
a. Press down on the two raised points of the clip's top surface to release it from the VRM connector.
b. Lift the clip away from the VRM (see the following figure).
Removing the VRM
4. Grasp the VRM by its top corners, and ease it out of its connector.
Replacing the VRM
1. Align the slot on the bottom of the new VRM with the ridge inside the connector.
2. Press the VRM straight into the connector.
3. Replace the VRM securing clip:
a. Lower the clip onto the VRM so that the top corners of the VRM go through the slots in the clip.
b. Press down on the two raised points of the clip's top surface to secure it to the VRM connector (see "Removing the VRM").
NOTE: If enabled, the Chassis Intrusion option will cause the following message to be displayed at the next system start-up:
CAUTION: Before you perform this procedure, see "Safety First— For You and Your Computer."
NOTICE: Before disconnecting a peripheral device from the computer, wait 10 to 20 seconds after disconnecting the computer from its electrical outlet.
Before removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see
"System Board Components."
- Notes, Notices, and Cautions 1
- About Your Computer 2
- Back View of Your Computer 3
- Inside Your Computer 4
- System Board Components 5
- Advanced Features 6
- Manageability 7
- Security 8
- Password Protection 9
- Setup Password 10
- Jumper Settings 11
- Installing a TAPI Device 12
- Power Management 13
- Installing Upgrades 15
- Power Supply 17
- Front Panel 17
- System Memory 18
- Upgrading System Memory 19
- Removing a Memory Module 19
- Disk Drives and Media 20
- General Guidelines 25
- EIDE Cables 25
- SCSI ID Numbers 25
- Device Termination 25
- AGP Card Brace 26
- Expansion Cards 26
- Removing the Filler Bracket 27
- Microprocessor 29
- Removing the Microprocessor 31
- Removing the VRM 32
- Replacing the VRM 32
- System Battery 33
- Back to Contents Page 34
- Technical Specifications 35
- Solving Problems 38
- Monitor Problems 39
- Video Problems 39
- Sound and Speaker Problems 40
- Printer Problems 41
- Mouse Problems 43
- Keyboard Problems 43
- Diskette Drive Problems 44
- Hard Drive Problems 45
- Battery Problems 47
- Expansion-Card Problems 47
- Repairing a Wet Computer 48
- Hardware Conflicts 49
- System Memory Problems 50
- Microprocessor Problems 50
- System Board Problems 51
- Dell Diagnostics 52
- Advanced Testing 53
- Messages and Codes 54
- System Beep Codes 56
- Warning Messages 57
- Diagnostics Messages 57
- Diagnostic Indicators 57
- Back-Panel Indicators 58
- Software Problems 59
- BIOS Recovery Utility 61
- Getting Help 62
- Problems With Your Order 63
- Product Information 63
- Before You Call 63
- Dell Contact Numbers 64
- Additional Information 71
- IC Notice (Canada Only) 72
- CE Notice (European Union) 72
- Battery Disposal 72
- VCCI Notice (Japan Only) 73
- MIC Class A Regulatory Mark 74
- Class B Device 74
- MIC Class B Regulatory Mark 74
- BSMI Notice (Taiwan Only) 75
- ENERGY STAR®Compliance 76
- Coverage During Year One 77
- General Provisions 77
- Safety Instructions 80
- Overview 82
- New User Interface 82
- Clean Desktop Wizard 83
- Taskbar Grouping 83
- Notification Area Cleanup 83
- System Restore 84
- Restore Process 85
- Driver Rollback 85
- How to Add Users 86
- Internet Connection Firewall 87
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