Dell Latitude 3540 Owners Manual - Page 48

Battery Status Lights If the computer is connected to an electrical outlet, the battery light operates as follows: • Alternately blinking amber light and white light - An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop. • Alternately blinking amber light with steady white light - Temporary battery failure with AC adapter present. • Constantly blinking amber light - Fatal battery failure with AC adapter present. • Light off - Battery in full charge mode with AC adapter present. • White light on - Battery in charge mode with AC adapter present. 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 48