Hardware/Diagnostics and Repair
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Early Boot Failures
| LED behavior | Notes |
|---|---|
| Front panel LED blinks red. The back fan is not spinning. SoC voltage rails are inactive. |
The power regulators' PGOOD signal tripped, and the SMC turned off the regulators. |
| Front panel LED stays red after pressing Power/Eject. The back fan is not spinning. SoC voltage rails are active. |
boot0 failure. The specific error code will blink on NDEV_LED, however this usually means that the copy of boot1 in NAND is corrupt. |
| Front panel LED blinks blue. The back fan is spinning. |
boot1 failure. The specific error code will blink on NDEV_LED. This may mean that the filesystem on SLC NAND is corrupt, however it could also mean that the RTC failed to read, DRAM failed to initialize (which can also be caused by RTC failures, since it stores a semi-warmboot flag), IOSU's fw.img is corrupt/failed signature checks/doesn't exist, etc. |
| Front panel LED is solid blue. The back fan is spinning. |
boot1 loaded, verified and jump to IOSU. IOSU might not show an error code. |