5
Troubleshooting Your Computer
You can troubleshoot your computer using indicators like Diagnostic Lights, Beep Codes, and Error Messages during the
operation of the computer.
Diagnostic Power LED Codes
Power LED Power State
OFF Power is off or the system is in an S4 (hibernate) or S5 (Powered Off) power state. LED is blank.
Solid White The computer is in power-on state.
Solid Amber The system board cannot start initialization. There may be an issue with the system board, memory,
processor or the power supply.
Blinking White The system board cannot start initialization or in an S3 (Sleep state) power state. There is a power
problem, a device may be malfunctioning or incorrectly installed.
Diagnostic Beep Codes
No POST with three beeps is accompanied by a blinking amber power LED. All other beep codes will be accompanied by
a solid white power LED. Refer to the table below for each scenario.
Beep Description Failure Coverage
1 BIOS ROM checksum in progress or failure. BIOS
Chip
System board failure, covers BIOS corruption or
ROM error
2 No RAM Detected Memory failure
3 Chipset Error (North and South Bridge Chipset,
DMA/IMR/Timer Error for Intel platform); Chipset
Error
System board Failure
Time-Of-Day Clock test failure.
Gate A20 failure
Super I/O chip failure
Keyboard controller test failure.
4 RAM Read/Write failure Memory failure
5 RTC Power Fail CMOS battery failure
6 Video BIOS Test Failure Video card failure
7 CPU Failure CPU
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