37Using Support ToolsSystem MessagesIf your computer has an issue or error, it maydisplay a System Message that will help youidentify the cause and action needed to resolvethe 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.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. See “Contacting Dell” on page 54for more assistance.CMOS checksum error — Possible motherboardfailure or RTC battery low. Battery needsreplacement. See the Service Manual on theDell Support website at support.dell.com or see“Contacting Dell” on page 54 for assistance.CPU fan failure — CPU fan has failed. CPU fanneeds replacement. See the Service Manual onthe Dell Support website at support.dell.com.Hard-disk drive failure — Possible hard diskdrive failure during HDD POST. See “ContactingDell” on page 54 for assistance.Hard-disk drive read failure — Possible harddisk drive failure during HDD boot test. See“Contacting Dell” on page 54 for assistance.Keyboard failure — Replace keyboard or checkthe cable for loose connection.