Diagnostic LEDs

The Power LED and HDD LED also function as diagnostic indicators, defined below.

Note

The cell colors indicate the color of the LED at that particular time.

Current System Operation	Suspect Component/ Failure	Terminal State	HDD LED	Power LED	Debug Path
Normal Operation	N/A	System ON	OFF	ON	N/A
Normal Operation	N/A	System ON with SSD Activity	Flashing (SSD Access)	ON	N/A
Normal Operation	N/A	Unit in Suspend (S3/S4)	ON	Blinking (1x/sec)	N/A
OFF with AC Present	N/A	OFF, Not in Standby. External power supply is on.	ON	OFF	N/A
OFF with AC Present	Power System	OFF, Not in Standby. External power supply is on.	OFF	OFF	Check AC power to power supply. Check power supply. Check connection between unit and power supply. Check power connection from back panel to motherboard and motherboard to front panel. Replace power supply. Replace motherboard. Replace front panel board.
Runtime	Cooling Solution/CPU	Over Temperature	N/A	Flashes red/green, then solid red as temperature increases	Check for blocked cooling vents. Check for fan failure. Check for excessive ambient temperature. Check cooling solution.
POST	CPU	CPU not Operating	ON	ON	Check for correctly installed CPU. Replace motherboard.
POST	BIOS Chip	BIOS Checksum Failure	Flashing (4x/sec)	ON	Perform BIOS crisis recovery. Replace BIOS chip. Replace motherboard.
POST	Memory	Memory Issue	Flashing (1x/sec)	ON	Check for properly installed memory. Replace memory. Replace motherboard.
POST	Motherboard	No Display	Flashing (1x/4 sec)	ON	Replace motherboard.
POST	Display, Motherboard, Peripheral	Stopped Prior to Boot	Flashing (1x/8 sec)	ON	No Display: Check for power to display. Check cable connection between unit/ motherboard and display. Check for properly functioning display. Replace motherboard. Display Working: Use display to determine failure point via onscreen message and BIOS setup.
Boot Time	Boot Media (SSD, LAN)	Display is working, but unit will not boot or it booted from wrong device.	OFF	ON	SSD is Boot Device: Check SSD status in BIOS setup. Check connections between SSD and motherboard. Replace or re-image SSD. Replace motherboard. LAN is Boot Device: Check for LAN link and activity LEDs on back panel. Check LAN cable. Replace motherboard.