The following table shows the different power and battery-status light patterns and the associated issues.
Table 20. LED codes
Diagnostic light codes Problem description
2,1 Processor failure
2,2 System board: BIOS or ROM (Read-Only Memory) failure
2,3 No memory or RAM (Random-Access Memory) detected
2,4 Memory or RAM (Random-Access Memory) failure
2,5 Invalid memory installed
2,6 System-board or chipset error
2,7 Display failure
2,8 LCD power rail failure.
3,1 CMOS battery failure
3,2 PCI, video card/chip failure
3,3 Recovery image not found
3,4 Recovery image found but invalid
3,5 Power-rail failure
3,6 System BIOS Flash incomplete
3,7 Management Engine (ME) error
Real-Time Clock (RTC Reset)
The Real Time Clock (RTC) reset function allows you to recover Dell computer from No POST, No Power or, No Boot like
situations. There is no coin-cell battery on this computer, the main battery reserves 2% of its capacity for RTC function.
How to Reset the Real-Time Clock (RTC)
● Start the RTC reset with the computer powered off and connected to AC power.
● Press and hold the power button for thirty (30-35) seconds.
● The computer RTC Reset occurs after you release the power button.
NOTE: For more information, see the knowledge base article 000125880 at https://www.dell.com/support/.
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.
5. Turn on the wireless router.
6. Turn on the modem.
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Troubleshooting
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