35Using 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 forthe same error. Contact Dell for assistance (see“Contacting Dell” on page 55).CMOS checksum error — Possiblemotherboard failure or coin‑cell battery low.Battery needs replacement. See the ServiceManual at support.dell.com/manuals or contactDell for assistance (see “Contacting Dell” onpage 55).CPU fan failure — CPU fan has failed. CPUfan needs replacement. See the Service Manualat support.dell.com/manuals.System fan failure — System fan has failed.System fan needs replacement. See the ServiceManual at support.dell.com/manuals.Hard-disk drive failure — Possible hard‑diskdrive failure during HDD POST. Contact Dell forassistance (see “Contacting Dell” on page 55).Hard-disk drive read failure — Possiblehard‑disk drive failure during HDD boot test.Contact Dell for assistance (see “ContactingDell” on page 55).Keyboard failure — Replace keyboard or checkthe cable for loose connection.