Code Cause and Troubleshooting Steps1 BIOS ROM checksum in progress or failureSystem board failure, covers BIOS corruption or ROM error2 No RAM detectedNo memory detected3 Chipset Error (North and South Bridge Chipset, DMA/IMR/ Timer Error) , Time-Of-Day Clock testfailure , Gate A20 failure , Super I/O chip failure , Keyboard controller test failureSystem board failure4 RAM Read/Write failureMemory failure5 Real-time clock power failCMOS battery failure6 Video BIOS test failureVideo card failure7 CPU - cache test failureProcessor failure8 DisplayDisplay failureLED Error CodesDiagnostic LED codes are communicated via the Power Button LED. The Power Button LED blinks the correspondingLED codes for the corresponding fault condition. Example: For No Memory detected (LED code 2) , The Power ButtonLED blinks two times followed by a pause, blinks two times, pause, etc. This pattern continues until the system ispowered off.Code Cause and Troubleshooting Steps1 System board: BIOS ROM failureSystem board failure, covers BIOS corruption or ROM error2 MemoryNo memory/RAM detected3 Chipset Error (North and South Bridge Chipset, DMA/IMR/ Timer Error) , Time-Of-Day Clock testfailure , Gate A20 failure , Super I/O chip failure , Keyboard controller test failureSystem board failure4 RAM Read/Write failureMemory failure5 Real-time clock power fail37