51Using Support ToolsSystem MessagesIf your computer has an issue or error, it may displaya System Message that will help you identify thecause 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. Alternativelyyou could see the Dell TechnologyGuide available on your hard drive or atsupport.dell.com or see “Contacting Dell”on page 71 for assistance.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 71).CMOS checksum error — Possiblemotherboard failure or RTC battery low.Replace the battery (see the Service Manual atsupport.dell.com/manuals) or contact Dell (see“Contacting Dell” on page 71).CPU fan failure — CPU fan has failed.Replace the CPU fan (see the Service Manualat support.dell.com).