25 Troubleshooting......................................................................................76Diagnostic LEDs.............................................................................................................. 76Beep Codes..................................................................................................................... 86Error Messages...............................................................................................................89Address mark not found............................................................................................89Alert! Previous attempts at booting this system have failed at checkpoint[nnnn]. For help in resolving this problem, please note this checkpoint andcontact Dell Technical Support................................................................................ 89Alert! Security override Jumper is installed.............................................................89Attachment failed to respond................................................................................... 89Bad command or file name ......................................................................................89Bad error-correction code (ECC) on disk read......................................................... 89Controller has failed..................................................................................................90Data error .................................................................................................................90Decreasing available memory ................................................................................. 90Diskette drive 0 seek failure..................................................................................... 90Diskette read failure................................................................................................. 90Diskette subsystem reset failed................................................................................90Gate A20 failure........................................................................................................ 90General failure ......................................................................................................... 91Hard-disk drive configuration error ......................................................................... 91Hard-disk drive controller failure..............................................................................91Hard-disk drive failure ............................................................................................. 91Hard-disk drive read failure......................................................................................91Invalid configuration information-please run SETUP program.................................91Invalid Memory configuration, please populate DIMM1..........................................91Keyboard failure....................................................................................................... 92Memory address line failure at address, read value expecting value .................... 92Memory allocation error...........................................................................................92Memory data line failure at address, read value expecting value........................... 92Memory double word logic failure at address, read value expecting value............ 92Memory odd/even logic failure at address, read value expecting value................. 92Memory write/read failure at address, read value expecting value........................ 92