Dell OptiPlex 990 Support Question
Dell OptiPlex 990 Support Question
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Question posted by ansaketh on July 17th, 2014
Dell 990 Will Not Power On No Light With Reset Button Either
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Current Answers
Answer #1: Posted by freginold on August 3rd, 2014 4:56 AM
freginold
Member since:
December 20th, 2011 Points: 23,253,885
Member since:
December 20th, 2011 Points: 23,253,885
Often when a computer won't turn on, it's because one of two components has failed: either the power supply unit or themotherboard (assuming you've ruled out the power coming in from the wall or surge protector as the problem).
Power supplies are generally not terribly expensive, compared to other components. If you're not getting any power at all, the power supply is a likely culprit. It's a much cheaper option to try than the motherboard. If you have a voltmeter or a power supply tester, you can check the power supply to verify that it's not supplying any power.
The motherboard is expensive to replace, so if you think the motherboard is the problem (if you've tried the power supply or ruled it out as the problem) it might be cheaper to get a new computer than have the motherboard repaired or replaced.
Power supplies are generally not terribly expensive, compared to other components. If you're not getting any power at all, the power supply is a likely culprit. It's a much cheaper option to try than the motherboard. If you have a voltmeter or a power supply tester, you can check the power supply to verify that it's not supplying any power.
The motherboard is expensive to replace, so if you think the motherboard is the problem (if you've tried the power supply or ruled it out as the problem) it might be cheaper to get a new computer than have the motherboard repaired or replaced.
Related Dell OptiPlex 990 Manual Pages
User Manual - Page 1
...power connector 13. power supply diagnostic button 12. security-cable slot 16. Dell OptiPlex 990
Setup And Features Information
About Warnings
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
Mini Tower - power button, power light 2. optical-drive bay (optional) 3. optical drive (optional) 7. drive activity light 10. power supply diagnostic light...
User Manual - Page 2
... (4)
9. back panel connectors 13. Front And Back View Of Desktop
1. optical drive 2. power supply diagnostic light 15. power supply diagnostic button
2 microphone connector 6. Desktop - drive activity light 8. power connector 12. Front And Back View
Figure 2. power button, power light 4. USB 2.0 connectors (4) 5. padlock ring 10. security-cable slot 11. headphone connector...
User Manual - Page 3
... connector 7. back panel connectors 15. Front And Back View Of Small Form Factor
1. drive activity light
9. power connector 12. power supply diagnostic light 14. microphone connector 6. Small Form Factor - power supply diagnostic button 13. optical drive 2. security-cable slot 11. Front And Back View
Figure 3. power button, power light 4. USB 2.0 connectors (4) 5. diagnostic...
User Manual - Page 4
... connector 15. line-out connector 16. USB 2.0 connectors (5) 21. power button, power light 4. diagnostic lights (4) 6. captive thumbscrew
12. serial connector 20. link integrity light
4 DisplayPort connector 18. VGA connector 19. network connector 22. optical-drive eject button 3. drive activity light 5. USB 2.0 connectors (2) 9. Ultra Small Form Factor - Front And Back...
User Manual - Page 10
... computer) and the electrical outlet. Back of computer
Power button light
Blue light - If the LED does not light up . When the system power supply voltage is within specification, the self-test LED lights up , the power supply may be connected during this test.
10 two • Desktop - Solid amber light when the computer does not start indicates a problem...
Technical Guide - Page 3
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 MINI TOWER COMPUTER (MT) VIEW
FRONT VIEW
BACK VIEW
1 Power Button, Power Light
6 Optical Drive (optional)
10 Power Supply Diagnostic 14 Expansion Card Slots(4) Light
2 Optical Drive Bay (optional)
3 Headphone Connector
4 Microphone Connector
7 Optical Drive Eject Button 8 USB 2.0 Connectors (4) 9 Drive Activity Light
11 Power ...
Technical Guide - Page 4
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0
MT System Board Components
Number
Name
Number
...1 Connector(SATA1)
14
PCI-e 4x Connector(SLOT4)
15
Intrusion Switch Connector (INTRUDER)
16
System Fan Connector (FAN_HDD)
17
P2 Power Connector (12V_PWRCONN)
6
SATA 2 Connector(SATA2)
18
Processor Connector (N/A)
7
SATA 3 Connector(SATA3)
8
Internal USB Connector (INT_USB)...
Technical Guide - Page 5
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 DESKTOP COMPUTER (DT) VIEW
FRONT VIEW 1 Optical Drive
BACK VIEW 5 Microphone Connector 9 Padlock Ring
13 Expansion Card Slots(4)
2 Optical Drive Eject Button 6 Headphone Connector 10 Security Cable Slot
3 Power Button, Power Light
4 USB Connectors (4)
7 Drive Activity Light 8 Diagnostic Lights (4)
11 Power Connectors 12 Back Panel ...
Technical Guide - Page 6
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0
DT System Board Components
Number
Name
1
Internal Speaker Connector
(INT_SPKR)
2
Front IO Connector (...
15
Thermal Sensor Connector(THRM_1)
16
System Fan Connector (FAN_HDD)
17
P2 Power Connector
(12V_PWRCONN)
18
Processor Connector (N/A)
19
CPU Fan Connector (FAN_CPU)
20
Memory Connectors(DIMM1, DIMM2,
DIMM3, DIMM4)...
Technical Guide - Page 7
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 SMALL FORM FACTOR COMPUTER (SFF) VIEW
FRONT VIEW
1 Optical Drive
5 Microphone Connector
2 Optical Drive Eject Button 6 Headphone Connector
3 Power Button, Power Light
4 USB 2.0 Connectors (2)
7 Diagnostic Lights (4) 8 Drive Activity Light
BACK VIEW 9 Padlock Ring
10 Security Cable Slot 11 Power Connectors
13 Power Supply Diagnostic...
Technical Guide - Page 8
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0
SFF System Board Components
Number
Name
1
P1 power Connector (POWER)
2
System fan Connector (FAN_HDD)
3
Internal Speaker Connector (INT_SPKR)
4
Buzzer (BEEP)
5
PCI-e 4x Connector(SLOT2)
6
PCI-e 16x Connector(SLOT1)
7
SATA 2 Connector(SATA2)
8
SATA 1 Connector(SATA1)
9
SATA 0 ...
Technical Guide - Page 9
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 ULTRA SMALL FORM FACTOR COMPUTER (USFF) VIEW
FRONT VIEW 1 Optical Drive
2 Optical Drive Eject Button
3 Power Button, Power Light
4 Drive Activity Light
5 Diagnostic Lights (4)
6 Headphone Connector 7 Microphone Connector 8 USB Connectors (2)
BACK VIEW
10 Wi-Fi Antenna (optional) 17 Line-in/ Microphone Connector
11 Network Activity ...
Technical Guide - Page 10
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0
USFF System Board Components
Number
Name
Number
Name
1
Front Panel Connector (FRONTPANEL)
10
SATA 1 Connector(SATA_1)
2
Memory Connector(DIMM_2)
11
SATA 0 Connector(SATA_0)
3
Memory Connector(DIMM_1)
12
P1 Power Connector(POWER1)
4
CPU Fan Connector (FAN_CPU)
13
HDD-ODD Power Connector (HDD_ODD_POWER)
5
Internal ...
Technical Guide - Page 17
... Dell Business Audio Speaker Dell AX210 2.0 Desktop Speakers Dell AX510/AX510PA Flat Panel Soundbar Speakers
KEYBOARD AND MOUSE
Dell USB Entry Keyboard with optional palmrest Dell Multimedia Pro Keyboard Dell Smartcard Keyboard Dell USB Optical Mouse Dell ... and SFF supports low profile (LP) cards.
COMMUNICATIONS - DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0
COMMUNICATIONS -
Technical Guide - Page 21
....0v output
+5.0v auxiliary output -12.0v output Max total power Max combined +3.3v / +5.0v power Max combined 12.0v power (note: only if more efficient Active Power Factor Correction (APFC) power supply. N/A 0.1 A 200W N/A
200W
682 BTU
N/A
Yes Yes Yes
Yes
21 DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 POWER
NOTE: These form factors utilize a more than one 12v...
Technical Guide - Page 22
... Wave output for APFC PSUs, not an approximation of a Sine Wave, Square Wave, or quasi-Square Wave. DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 POWER
NOTE: These form factors utilize a more efficient Active Power Factor Correction (APFC) power supply.
If you have questions, please contact the manufacture to confirm the output type.
3.0v CMOS battery (Type...
Technical Guide - Page 23
...Data transfer mode (example Bus-Master DMA) Power consumption (full operation per data rate connection speed) Power consumption (standby operation) IEEE standards compliance (example...
100~150 ohm 1~4 ohm
2Watt (peak) / 1Watt (average)
COMMUNICATIONS - DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0
AUDIO
INTEGRATED REALTEK ALC269Q HIGH DEFINITION AUDIO High Definition Stereo support...
Technical Guide - Page 24
... PCIe 1.0a x1)
Integrated memory
Data transfer mode (example Bus-Master DMA)
Power consumption (full operation per data rate connection speed)
Power consumption (standby operation)
IEEE standards compliance (example 802.1P)
Hardware Certifications (example... does not connote an actual operating speed of 1 Gb/sec.
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 COMMUNICATIONS -
Technical Guide - Page 26
DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 COMMUNICATIONS -
USB 3.0 PORT PCIE ADD-IN CARD Connector Type Controller Details Controller bus architecture (example PCIe 1.0a x1) Chipset IO Ports Power Consumption Connector Full height USB3.0 add-in card Half height USB3.0 add-in card OS Support
MT
DT
SFF
PCI Express Gen. 2.0 X1
Optional
PCI ...
Technical Guide - Page 28
...: Analog and/or digital) External Connectors
DisplayPort Bus Type Maximum supported resolution Maximum power consumption External connectors
MT
DT
SFF
USFF
Integrated Gen6 Core Intel® HD Graphics... memory (Up to
1.7GB with Celeron/Pentium class CPU-GPU combo] 2. DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0
GRAPHICS/VIDEO CONTROLLER
NOTE: MT supports full height (FH) cards ...
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