49Using Support ToolsSystem MessagesIf your computer has an issue or error, it maydisplay a system message that will help you identifythe cause and action needed to resolve the issue.NOTE: If the message you received is notlisted in the following examples, see thedocumentation for either the operatingsystem or the program that was runningwhen the message appeared. You can alsorefer to the Dell Technology Guide availableon your hard drive or atsupport.dell.com/manuals or contact Dell(see “Contacting Dell” on page 68).Alert! Previous attempts at booting this systemhave failed at checkpoint [nnnn]. For helpin resolving this problem, please note thischeckpoint and contact Dell TechnicalSupport — The computer failed to completethe boot routine three consecutive times for thesame error. Contact Dell (see “Contacting Dell”on page 68).CMOS checksum error — Possible motherboardfailure or Real Time Clock (RTC) battery low.Replace the coin-cell battery (see the ServiceManual at support.dell.com/manuals) or contactDell (see “Contacting Dell” on page 68).CPU fan failure — CPU fan has failed. Replacethe CPU fan (see the Service Manual atsupport.dell.com/manuals).Hard-disk drive failure — Possible harddrive failure during POST. Contact Dell (see“Contacting Dell” on page 68).Hard-disk drive read failure — Possible harddrive failure during HDD boot test. Contact Dell(see “Contacting Dell” on page 68).Keyboard failure — Keyboard failure orloose cable.To replace the keyboard, see the ServiceManual at support.dell.com/manuals.No boot device available — No bootablepartition on hard drive, the hard drive cable isloose, or no bootable device exists.