Dell Precision M6500 (Late 2009) - Manual (Page 14)

Turns on when the numeric keypad is enabled.
Turns on when the Caps Lock function is enabled.
Turns on when the Scroll Lock function is enabled.
LED Error Codes
The following table shows the possible LED codes that may display in a no-POST situation.
Appearance Description Next Step
ON-FLASH-FLASH
No SODIMMs are
installed
1. Install supported memory modules.
2. If memory is already present,
reseat the module(s) one at time in
each slot.
3. Try known good memory from
another computer or replace the
memory.
4. Replace the system board.
FLASH-ON-ON
System board error
1. Reseat the processor.
2. Replace the system board.
3. Replace the processor.
FLASH-ON-FLASH
LCD panel error
1. Reseat the LCD cable.
2. Replace the LCD panel.
3. Replace the video card/system
board.
OFF-FLASH-OFF
Memory compatibility
error
1. Install compatible memory
modules.
2. If two modules are installed
remove one and test. Try the other
module in the same slot and test.
Test the other slot with both
modules.
3. Replace the memory.
4. Replace the system board.
ON-FLASH-ON
Memory is detected
but has errors
1. Reseat the memory.
2. If two modules are installed
remove one and test. Try the other
module in the same slot and test.
Test the other slot with both
modules.
3. Replace the memory.
4. Replace the system board.
OFF-FLASH-FLASH
Modem error
1. Reseat the modem.
2. Replace the modem.
3. Replace the system board.