| 
   PCA Diagnostic Lights  | 
 ||
| 
   Light  | 
  
   Beeps  | 
  
   Meaning and
  Required Action  | 
 
| 
   Cap Lock  | 
  
   1 long 2 short   | 
  
   Flashes when a graphics controller is not present or in incorrectly
  initialized. This feature is supported by the 12/17/97 or later system ROM.  | 
 
| 
   Num Lock  | 
  
   1 short 2 long   | 
  
   Flashes when system memory is not present or is
  incompatible. This feature is supported by the 12/17/97 or later system ROM.  | 
 
| 
   Scroll Lock  | 
  
   2 long 1 short  | 
  
   Flashes when there is a system board hardware failure.
  This feature is supported by the 12/17/97 or later system ROM.  | 
 
| 
   "Incompatible DIMM" message displayed at POST  | 
  
   Detect incompatible DIMMs, those that do not meet Compaq
  specifications. Not beeps or LED flashes.  | 
 |
| 
   Power and Hard Drive Activity  | 
  
      | 
  
   Flashes together when the riser board is not fully seated
  or is not present on the system board. This feature is supported by the
  system board with Assy# 008093-101, 008096-101 and 008219-101.  | 
 
NOTE: LEDs cannot be blinked on USB keyboards. The beeps were added for this reason.