Dell Latitude ST Owner's Manual - Page 57

Beep Codes, LED Error Codes - power problem

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Beep Codes The computer may emit a series of beeps during start-up if the display cannot show errors or problems. These series of beeps, called beep codes, identify various problems. The delay between each beep is 300 ms, the delay between each set of beeps is 3 seconds, and the beep sound lasts 300 ms. After each beep and each set of beeps, the BIOS should detect if the user presses the power button. If so, BIOS will jump out from looping and execute the normal shutdown process and power system. Code Cause and Troubleshooting Steps 1 BIOS ROM checksum in progress or failure System board failure, covers BIOS corruption or ROM error 2 No RAM detected No memory detected 3 Chipset Error (North and South Bridge Chipset, DMA/IMR/ Timer Error) , Time-Of-Day Clock test failure , Gate A20 failure , Super I/O chip failure , Keyboard controller test failure System board failure 4 RAM Read/Write failure Memory failure 5 Real-time clock power fail CMOS battery failure 6 Video BIOS test failure Video card failure 7 CPU - cache test failure Processor failure 8 Display Display failure LED Error Codes Diagnostic LED codes are communicated via the Power Button LED. The Power Button LED blinks the corresponding LED codes for the corresponding fault condition. Example: For No Memory detected (LED code 2) , The Power Button LED blinks two times followed by a pause, blinks two times, pause, etc. This pattern continues until the system is powered off. 57

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Beep Codes
The computer may emit a series of beeps during start-up if the display cannot show errors or problems. These series of
beeps, called beep codes, identify various problems. The delay between each beep is 300 ms, the delay between each
set of beeps is 3 seconds, and the beep sound lasts 300 ms. After each beep and each set of beeps, the BIOS should
detect if the user presses the power button. If so, BIOS will jump out from looping and execute the normal shutdown
process and power system.
Code
Cause and Troubleshooting Steps
1
BIOS ROM checksum in progress or failure
System board failure, covers BIOS corruption or ROM error
2
No RAM detected
No memory detected
3
Chipset Error (North and South Bridge Chipset, DMA/IMR/ Timer Error) , Time-Of-Day Clock test failure , Gate
A20 failure , Super I/O chip failure , Keyboard controller test failure
System board failure
4
RAM Read/Write failure
Memory failure
5
Real-time clock power fail
CMOS battery failure
6
Video BIOS test failure
Video card failure
7
CPU - cache test failure
Processor failure
8
Display
Display failure
LED Error Codes
Diagnostic LED codes are communicated via the Power Button LED. The Power Button LED blinks the corresponding
LED codes for the corresponding fault condition. Example: For No Memory detected (LED code 2) , The Power Button
LED blinks two times followed by a pause, blinks two times, pause, etc. This pattern continues until the system is
powered off.
57