Error Messages DescriptionUNEXPECTED INTERRUPT IN PROTECTED MODE The keyboard controller may be malfunctioning, or amemory module may be loose. Run the System Memorytests and the Keyboard Controller test in the contact Dell.X:\ IS NOT ACCESSIBLE. THE DEVICE IS NOT READY Insert a disk into the drive and try again.WARNING: BATTERY IS CRITICALLY LOW The battery is running out of charge. Replace the battery,or connect the computer to an electrical outlet; otherwise,activate hibernate mode or shut down the computer.System Error MessagesSystem Message DescriptionAlert! Previous attempts at booting this system have failedat checkpoint [nnnn]. For help in resolving this problem,please note this checkpoint and contact Dell TechnicalSupportThe computer failed to complete the boot routine threeconsecutive times for the same error.CMOS checksum error Possible motherboard failure or Real-time clock (RTC)battery low.CPU fan failure CPU fan has failedSystem fan failure System fan has failedHard-disk drive failure Possible hard disk drive failure during POSTKeyboard failure Keyboard failure or loose cable. If reseating the cabledoes not solve the problem, replace the keyboard.No boot device available No bootable partition on hard disk drive, the hard diskdrive cable is loose, or no bootable device exists.• If the hard drive is your boot device, ensure thatthe cables are connected and that the drive isinstalled properly and partitioned as a bootdevice.• Enter system setup and ensure that the bootsequence information is correct.No timer tick interrupt A chip on the system board might be malfunctioning ormotherboard failure.USB over current error Disconnect the USB device. The USB device needs morepower for it to function properly. Use an external powersource to connect the USB device, or if the device hastwo USB cables, connect both of them.CAUTION - Hard Drive SELF MONITORING SYSTEM hasreported that a parameter has exceeded its normaloperating range. Dell recommends that you back up yourdata regularly. A parameter out of range may or may notindicate a potential hard drive problemS.M.A.R.T error, possible hard disk drive failure46