Dell OptiPlex 790 Support Question
Dell OptiPlex 790 Support Question
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Question posted by dlmmwilbo on March 20th, 2014
Optiplex 790, Lights 2,3,4 Blinking Will Not Boot
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Current Answers
Answer #1: Posted by freginold on May 15th, 2014 4:22 PM
freginold
Member since:
December 20th, 2011 Points: 23,254,995
Member since:
December 20th, 2011 Points: 23,254,995
Hi, when a desktop computer won't turn on, it's typically one of two things: the power supply unit or the motherboard (assuming you've ruled out the power coming from the wall or surge protector).
Power supplies are generally not terribly expensive. 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.
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 790 Manual Pages
View - Page 1
... bay (optional) 3. expansion-card slots (4) 15. headphone connector 4. optical-drive eject button 8. drive activity light 10. back panel connectors 14. Mini-Tower - power supply diagnostic button 12. power connector 13. diagnostic lights (4) 6. Dell OptiPlex 790
Setup And Features Information
About Warnings
WARNING: A WARNING indicates a potential for property damage, personal injury, or...
Technical Guidebook - Page 1
DELL TM OPTIPLEXTM790
TECHNICAL GUIDEBOOK
INSIDE THE OPTIPLEX 790
Technical Guidebook - Page 3
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - V 1.6 MINI TOWER COMPUTER (MT) VIEW
FRONT VIEW
1 Power Button, Power Light
2 Optical Drive Bay (optional)
3 Headphone Connector
4 Microphone Connector
5 Diagnostic Lights (4)
6 Optical Drive (optional) 7 Optical Drive Eject Button 8 USB 2.0 Connectors (4) 9 Drive Activity Light
BACK VIEW
10 Power Supply Diagnostic Light
11 Power Supply ...
Technical Guidebook - Page 5
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - V 1.6 DESKTOP COMPUTER (DT) VIEW
FRONT VIEW 1 Optical Drive
2 Optical Drive Eject Button
3 Power Button, Power Light
4 USB Connectors (4)
5 Microphone Connector 6 Headphone Connector 7 Drive Activity Light 8 Diagnostic Lights (4)
BACK VIEW 9 Padlock Ring 10 Security cable slot
11 Power Connector
12 Back Panel Connectors
13 Expansion card ...
Technical Guidebook - Page 6
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - V 1.6 DESKTOP COMPUTER (DT) VIEW
Number
Name
Number
Name
1
Internal speaker connector(INT_SPKR)
13 PCI connector(SLOT3)
2
Front IO connector(FRONTPANEL)
14 PCI-e 4x connector(SLOT4)
3
Thermal ...
Technical Guidebook - Page 7
...
15 Expansion card slots(2)
12 Power Supply Diagnostic Button
BACK PANEL CONNECTORS
1 Mouse Connector
7 Keyboard Connector
2 Serial connector
8 Display Port Connector
3 Link Integrity Light
9 VGA Connector
4 Network Connector
10 USB Connectors (6)
5 Network Activity Light 6 Line-out Connector
11 Line-in/Microphone connector
7 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 8
... connector(DIMM1)
9 SATA 0 connector(SATA0)
20 Memory connector(DIMM4)
10 Front IO connector(FRONTPANEL)
21 Memory connector(DIMM2)
11 Intrusion switch connector(INTRUDER)
8 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 9
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - V 1.6 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 9 Wi-Fi Antenna (optional)
10 Network Activity Light 11 Captive Thumbscrew 12 ...
Technical Guidebook - Page 11
... more information regarding the configuration of your computer, click Start>Help and Support and select the option to view information about your computer. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
V 1.6
MARKETING SYSTEM CONFIGURATIONS
NOTE: Offerings may vary by country. no dedicated LOM
EEPROM
11
Technical Guidebook - Page 12
... (GSP) are a subset of Dell's relationship products that are not a measure of configurations managed on a worldwide basis. This allows customers to Dell customers.
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - They ensure the same platform is available for availability and synchronized transitions on a worldwide basis, thereby reducing their costs.
Technical Guidebook - Page 13
... modules should be less than 4GB. If the memory modules are not installed in matched pairs, the computer will be installed in performance. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 14
... (available after May19, 2011)
X
250GB1 SATA 7200 RPM HDD
X
128GB1 SATA Solid State Drive HDD
X
DT
SFF
USFF
1
1 (slim-line) 1 (slim-line)
1
1
1
1
1
1
2
2
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
14 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 15
.../s
SATA 1.5Gbit/s
X
SFF
SATA 1.5Gbit/s
SATA 1.5Gbit/s
USFF
SATA 1.5Gbit/s
SATA 1.5Gbit/s
NOTE: Dell 19 in card location and priority: PCI: 1394; DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
NOTE: Add in 1 Media Card Reader is supported via firmware modifications.
15 PCIe x16: GFX, USB 3.0, Serial, Parallel/Serial, NIC, Wireless; using DVD...
Technical Guidebook - Page 16
... LP card
1 Rear 1 Rear
1 Front 1 Rear 1 Front, 1 Rear
USFF
2 Front, 5 Rear
16 SFF supports low profile card.
SFF supports low profile card. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
V 1.6
GRAPHICS/VIDEO CONTROLLER
NOTE: MT supports full height card, DT supports low profile card. MT
Intel HD Graphics [with Celeron/Pentium class CPU...
Technical Guidebook - Page 17
...
Optional 17 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - WIRELESS
Dell... Wireless 1520 PCIe WLAN card (802.11n) Dell Wireless 1520 half miniPCIe WLAN card (802.11n)
MT
DT
SFF
Optional via add-in card
USFF Optional
AUDIO AND SPEAKERS
Realtek ALC269Q High Definition Audio Codec Internal Dell Business Audio Speaker Dell AX210 2.0 Desktop...
Technical Guidebook - Page 18
... SecurityCenter
MT
DT
SFF
USFF
Available via Dell.com
Standard
30 Day Trial or Optional Subscription
30 Day Trial or Optional Subscription
18 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - Depending on system board
Optional
Optional
Standard
1TPM is not available in all countries. U.S.
Service timing dependent upon time of service contract...
Technical Guidebook - Page 19
...
11.42 / 29
9.32 / 23.67
Width (inches/centimeters)
6.89 / 17.5
4.02 / 10.2
3.65 / 9.26
2.56 / 6.5
Depth (inches/centimeters) Shipping Weight (pounds/kilograms - DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - A typical configuration includes: integrated graphics, one hard drive, one optical drive, and one diskette drive.
Technical Guidebook - Page 23
... Power consumption (standby operation) IEEE standards compliance (example 802.1P) Hardware Certifications (example FCC, B, GS mark...) Boot ROM Support Network Transfer Mode (example Full Duplex, Half Duplex)
Network Transfer Rate (example 10BASE-T (half-duplex) ...(peak) / 1Watt (average)
COMMUNICATIONS -
SFF supports low profile card. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 24
...speed)
Power consumption (standby operation) IEEE standards compliance (example 802.1P)
Hardware Certifications (example FCC, B, GS mark...)
Boot ROM Support
Network Transfer Mode (example Full Duplex, Half Duplex) Network Transfer Rate (example 10BASE-T (half-duplex) 10... height card, DT supports low profile card. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - SFF supports low profile card.
Technical Guidebook - Page 42
...Control Override: Wake on LAN:
Service Tag: Asset Tag: SERR Message:
Numlock LED: USB Emulation:
Keyboard Errors: POST HotKeys: Fast Boot:
Enable Enable COM1 AHCI Enable USB Controller Disable Enable Enable (Front USB, Rear Dual USB, Rear Quad USB, PCI Slot) Enable ... factory Optional User Entry Enable
Enable Enable Enable Enable Thorough
42 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
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