Dell OptiPlex 3090 User Manual

Table 19. Diagnostic LED behavior (continued)
Blinking pattern
Problem description Suggested resolutionAmber White
4 2 CPU Power Cable Connection
Issue
● Run the PSU BIST
● If the BIST passes, but
the problem persists, run
the Dell Support Assist/
Dell Diagnostics tool.
Recovering the operating system
When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell
SupportAssist OS Recovery.
Dell SupportAssist OS Recovery is a standalone tool that is preinstalled in all Dell computers installed with Windows operating
system. It consists of tools to diagnose and troubleshoot issues that may occur before your computer boots to the operating
system. It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its
factory state.
You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their
primary operating system due to software or hardware failures.
For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at
www.dell.com/serviceabilitytools. Click SupportAssist and then, click SupportAssist OS Recovery.
Real-Time Clock (RTC Reset)
The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell systems from No POST/No
Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models.
Start the RTC reset with the system powered off and connected to AC power. Press and hold the power button for
thirty (30) seconds
. The system RTC Reset occurs after you release the power button.
Backup media and recovery options
It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows. Dell proposes
multiple options for recovering Windows operating system on your Dell PC. For more information. see Dell Windows Backup
Media and Recovery Options.
WiFi power cycle
About this task
If your computer is unable to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be
performed. The following procedure provides the instructions on how to conduct a WiFi power cycle:
NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device.
Steps
1. Turn off your computer.
2. Turn off the modem.
3. Turn off the wireless router.
4. Wait for 30 seconds.
84
Troubleshooting

Dell OptiPlex 3090 Specifications

General

Processor cache	8 MB
Processor cores	4
Processor model	i5-1145G7
Processor family	Intel® Core™ i5
Configurable TDP-up	28 W
Processor frequency	- GHz
Configurable TDP-down	12 W
Processor manufacturer	Intel
Processor boost frequency	4.4 GHz
Configurable TDP-up frequency	2.6 GHz
Number of processors installed	1
Configurable TDP-down frequency	1.1 GHz
Non-ECC	Yes
Memory slots	2x SO-DIMM
Internal memory	16 GB
Memory channels	Dual-channel
Memory clock speed	3200 MHz
Internal memory type	DDR4-SDRAM
Maximum internal memory	64 GB
Microphone in	No
DisplayPort version	1.4
USB 2.0 ports quantity	0
Power supply	65 W
Power supply input voltage	100 - 240 V
Power supply input frequency	50 - 60 Hz
Operating shock	110 G
Operating altitude	-15.2 - 3048 m
Non-operating shock	160 G
Operating vibration	0.66 G
Non-operating altitude	-15.2 - 10668 m
Non-operating vibration	1.3 G
Storage temperature (T-T)	-40 - 65 °C
Operating temperature (T-T)	0 - 35 °C
Storage relative humidity (H-H)	0 - 95 %
Operating relative humidity (H-H)	10 - 90 %
Antenna type	2x2
LAN controller	Realtek RTL8111HS
Wi-Fi standards	Wi-Fi 5 (802.11ac)
Bluetooth version	5.0
Cabling technology	10/100/1000Base-T(X)
WLAN controller model	Qualcomm QCA61x4A
Ethernet LAN data rates	10, 100, 1000 Mbit/s
WLAN controller manufacturer	Qualcomm
SSD capacity	256 GB
SSD interface	NVMe, PCI Express
Storage media	SSD
SSD form factor	M.2
Operating system architecture	64-bit
Chassis type	UFF
Product color	Black
Cable lock slot type	Kensington
Discrete graphics card model	Not available
On-board graphics card model	Intel Iris Xe Graphics
Audio chip	Realtek ALC3204-CG
Audio system	High Definition Audio
Product type	Mini PC

Weight and Dimensions

Depth	19.7 mm
Width	96.1 mm
Height	256.2 mm
Weight	650 g