Dell OptiPlex 790 Support Question
Dell OptiPlex 790 Support Question
Find answers below for this question about Dell OptiPlex 790.Need a Dell OptiPlex 790 manual? We have 2 online manuals for this item!
Question posted by kghoorun on August 21st, 2012
Why My Cpu Dell Optiplex 790 Power Switch Light Is Blinking
what cause this problem
Current Answers
Answer #1: Posted by DellJesse1 on August 21st, 2012 7:21 AM
DellJesse1
Member since:
April 19th, 2012 Points: 1,551,500
Member since:
April 19th, 2012 Points: 1,551,500
kghoorun,
I am sorry to hear about your system. There are some diagnostic led indicators.
The diagnostic LEDs are located on the front of the chassis next to the power button. These diagnostic LEDs are only active and visible during the POST process. Once the operating system starts to load, they turn off and are no longer visible.
What is the sequence of LED's that are lit up? If the number one LED is lit up and the power button blinking then the problem could be a possible system board failure, power supply, or peripheral failure has occurred.
Below are some things to try to determine the problem. Try the following and then email at my email address below to resolve this issue. Please include the steps you have tried. I will also need to know your name, address, phone number, email address, system service tag number and a brief description of the issue.
- Power off computer, leaving the computer plugged in. Press and hold the power supply test button on the rear of the power supply unit. If the LED next to the switch illuminates, the problem may be with your system board.
- If the LED next to the switch does not illuminate, disconnect all internal and external peripherals, and press and hold the power supply test button. If it illuminates, there could be a problem with a peripheral.
- If the LED still does not illuminate, remove the PSU connections from the system board, then press and hold the power supply button. If it illuminates, there could be a problem with the system board.
- If the LED still does not illuminate, the problem is probably with the power supply.
Thank You,
Dell-Jesse1
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Related Dell OptiPlex 790 Manual Pages
View - Page 1
... panel connectors 14. security-cable slot 16. Front And Back View
Figure 1. optical drive (optional) 7. power button, power light 2. diagnostic lights (4) 6. USB 2.0 connectors (4)
9. power supply diagnostic light 11. expansion-card slots (4) 15. Dell OptiPlex 790
Setup And Features Information
About Warnings
WARNING: A WARNING indicates a potential for property damage, personal injury, or...
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
...
14 Power Supply Diagnostic Light
15 Power Supply Diagnostic Button
BACK PANEL CONNECTORS
1 Mouse Connector
7 Keyboard Connector
2 Link Integrity Light
8 USB Connectors (6)
3 Network Connector
9 Display Port Connector
4 Network Activity Light 10 VGA Connector
5 Serial connector 6 Line-out Connector
11 Line-in/Microphone connector
5 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK...
Technical Guidebook - Page 6
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - V 1.6 DESKTOP COMPUTER (DT) VIEW
Number
Name
Number
Name
1
Internal speaker...(N/A)
7
Internal USB connector(INT_USB)
19 CPU fan connector(FAN_CPU)
8
LPC debug connector(LPC_DEBUG)
20 Memory connectors(DIMM1, DIMM2, DIMM3, DIMM4)
9
Intrusion switch connector (INTRUDER) 21 Power switch connector(PWR_SW)
10
Buzzer(BEEP)
22 Battery...
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
...
16 CPU fan connector(FAN_CPU)
6 PCI-e 16x connector(SLOT1)
17 Power switch connector(PWR_SW)
7 SATA 2 connector(SATA2)
18 Memory connector(DIMM3)
8 SATA 1 connector(SATA1)
19 Memory 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 - Page 9
...-Fi Antenna (optional)
10 Network Activity Light 11 Captive Thumbscrew 12 Padlock Ring 13 Security Cable Slot 14 Power Connector 15 Line-Out Connector
16 Line-in/ Microphone Connector
17 Display Port Connector 18 VGA Connector 19 Serial Connector
20 USB Connectors (5) 21 Network Connector 22 Link Integrity Light
9 DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 16
... for microphone or stereo Line out for port/connector locations USB 2.0 (1 internal on CPU
1GB AMD RADEON HD 6450 with DP and DVI
512MB AMD RADEON HD 6350 with dual...USFF
EXTERNAL PORTS/CONNECTORS
NOTE: MT supports full height card, DT supports low profile card. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - SFF supports low profile card. V 1.6
GRAPHICS/VIDEO CONTROLLER
NOTE: MT supports...
Technical Guidebook - Page 18
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - For more details on Dell Service Plans please to go to Dell. Service timing dependent upon time of service contract. only.
U.S. Subject to parts availability, geographical restrictions and terms of day call placed to : www.dell.com/service/service_plans
3 Year Warranty1 Next Business Day On-site2 (3-3-3) ProSupport
MT
DT
...
Technical Guidebook - Page 21
.../17A; 12VB/9A
12VA/17A; 12VB/9A
17.8A
17.8A
+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™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 22
... form factors utilize a more efficient Active Power Factor Correction (APFC) power supply. Continuous Discharge Under 15 kΩ Load to 2.5V EndVoltage. ... to 2.0V EndVoltage. 20℃±2℃.1000Hrs.
or Longer.970Hrs.or Longer after 12 months.
22 Dell recommends only Universal Power Supplies (UPS) based on Sine Wave output for APFC PSUs, not an approximation of a Sine Wave, ...
Technical Guidebook - Page 23
...Details
Controller bus architecture
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 (... ohm
100~150 ohm 1~4 ohm
2Watt (peak) / 1Watt (average)
COMMUNICATIONS - DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 24
... (example 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 FCC,....
1 This term does not connote an actual operating speed of 1 Gb/sec. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 26
...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
USFF
PCI..., Win Vista and Win 7 26 WIRELESS
NOTE: Native DisplayPort on the DT and SFF chassis. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK -
Technical Guidebook - Page 28
...VGA, DisplayPort
DisplayPort
Bus Type
DDPC
Maximum supported resolution
Up to 2560x1600 @ 60Hz
Maximum power consumption
N/A
External connectors
DisplayPort
DisplayPort Audio Support
Yes
1 Up to 1.7 GB of system..., DT supports low profile card.
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - Intel HD Graphics 2000 [with iCore Dual/Quad core class CPU-GPU combo] Bus Type
GPU core...
Technical Guidebook - Page 42
DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - V 1.6 BIOS DEFAULTS
System Configuration
Video Performance ...control:
Virtualization: VT for Direct I/O:
Administrator Password: System Password: Password Changes: TPM Security: CPU XD Support: Computrace®: SATA-0 Password:
Power Management Maintenance
AC Recovery: Auto On Time: Deep Sleep Control: Fan Control Override: Wake on ...
Technical Guidebook - Page 44
... Operating
5.1
5.1
The Declared A-weighted Sound Pressure Level in accordance with no other reported operating modes. 2 Declared Sound Power rounded to ISO 9296 except 90% CPU. DELL™ OPTIPLEX™ 790 TECHNICAL GUIDEBOOK - For this product is not specified in ISO 7779, but was stressed at Operator, Bystander, and Desk Side Positions are conducted according to...
Technical Guidebook - Page 45
... INFORMATION
OPTIPLEX 790 DT
Component
Typical Configuration
High-end Configuration
CPU
Intel l3... with ISO 9296 for the Dell OptiPlex 780 DT is as follows1:
Operating Mode
Idle HDD Operating 90% CPU ODD Operating
Typical Configuration Declared ...with no other reported operating modes. 2 Declared Sound Power rounded to ISO 9296 except 90% CPU. This test mode is as follows: (all values ...
Technical Guidebook - Page 46
...Power (LWAd)
3.6
High-end Configuration Declared Sound Power (LWAd)
3.9
HDD Operating
3.6
4.0
90% CPU
3.9
4.3
ODD Operating
4.6
4.6
The Declared A-weighted Sound Pressure Level in decibels (re 2x10-5 Pa), at 90% utilization with ISO 9296 for the Dell OptiPlex... Power rounded to ISO 9296 except 90% CPU. V 1.6
ACOUSTIC NOISE EMISSION INFORMATION
OPTIPLEX 790 SFF
Component CPU Memory...
Technical Guidebook - Page 47
... using the same microphone distances and measurement techniques defined for the Dell Optiplex 780 USFF is as follows: (all values LWAd expressed in bels; 1 bel=10 decibels, re 10-12 Watts)
Operating Mode
Idle
Typical Configuration Declared Sound Power (LWAd)
3.7
HDD Operating
3.7
90% CPU
4.3
ODD Operating
4.7
The Declared A-weighted Sound Pressure Level in accordance...
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