Service Reference Guide

Service Reference Guide D–1
D
Diagnostic Indicator Lights
✎
All indicator lights are not available on all products.
Keyboard Lights
LED Color LED Activity State/Message
Num Lock
Caps Lock
Scroll Lock
Green
Green
Green
Flashing
Flashing
Flashing
Memory error
No video
System board failure, prior to video
Chassis Indicator Lights—Desktop Computers and Workstations
LED Color LED Activity State/Message
Power
Power
Power
Green
Green
Green
On
1 blink/second
1 blink/second
Computer on
Normal suspend mode
Suspend to RAM
Power
Power
None
Red
None
On
Computer off
CPU not installed/fetching code
Power
Power
Power
Red*
Red*
Red*
4 blinks/second
Computer shuts down
2 blinks 1 second apart
followed by 2 second
pause then repeat pattern
CPU thermal shutdown
CPU thermal shutdown
CPU thermal shutdown
Power
Power
Power and
hard drive
Red
Red
Red
1 blink/second
1 blink/2 or more seconds
On
ROM error
Power supply overheated
Riser board not seated
*Varies by model.
**Most models. Blue LED glows on Evo Workstation W8000.