- Notes, cautions, and warnings
- Working on your computer
- Major components of your system
- Removing and Installing Components
- Recommended tools
- Screw list
- Disassembly and reassembly
- System setup
- Troubleshooting
- Getting help
Power and battery-status light
The power and battery status light indicates the power and battery status of the computer. These are the power states:
Solid white:Power adapter is connected and the battery has more than 5% charge.
Amber:Computer is running on battery and the battery has less than 5% charge.
The power and battery-status light may blink amber or white according to pre-defined "beep codes" indicating various failures.
For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by a pause. This 2,3 pattern continues until the computer is turned off, indicating no memory or RAM is detected.
The following table shows different power and battery-status light patterns and associated problems.
Diagnostic light codes (Amber,White) | Problem description | Recommended solutions |
---|---|---|
1,1 | TPM detection failure | |
1,2 | Unrecoverable SPI Flash Failure | |
2,1 | Processor failure | Replace the system board. |
2,2 | System board: BIOS or ROM (Read-Only Memory) failure | Flash latest BIOS version. If problem persists, replace the system board. |
2,3 | No memory or RAM (Random-Access Memory) detected | Confirm that the memory module is installed properly. If problem persists, replace the memory module. |
2,4 | Memory or RAM (Random-Access Memory) failure | Reset and swap memory modules among the slots. If problem persists, replace the memory module. |
2,5 | Invalid memory installed | Reset and swap memory modules among the slots. If problem persists, replace the memory module. |
2,6 | System-board or chipset error | Flash latest BIOS version. If problem persists, replace the system board. |
2,7 | Display failure - SBIOS message | Replace display cable (EDP) if possible, otherwise replace the display assembly (LCD). |
2,8 | Display failure - EC detection of power rail failure | |
3,1 | Coin-cell battery failure | Reset the CMOS battery connection. If problem persists, replace the RTC battery. |
3,2 | PCI, video card/chip failure | Replace the system board. |
3,3 | Recovery image not found | Flash latest BIOS version. If problem persists, replace the system board. |
3,4 | Recovery image found but invalid | Flash latest BIOS version. If problem persists, replace the system board. |
3,5 | Power-rail failure | EC ran into power sequencing failure. If problem persists, replace the system board. |
3,6 | System BIOS Flash incomplete | Flash corruption detected by SBIOS. If problem persists, replace the system board. |
3,7 | Management Engine (ME) error | Timeout waiting on ME to reply to HECI message. If problem persists, replace the system board. |