53Using 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. Alternativelyyou could see the Dell Technology Guideon your hard drive or on the Dell Supportwebsite at support.dell.com or see“Contacting Dell” on page 73 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 forthe same error. Contact Dell for assistance (see“Contacting Dell” on page 73).CMOS checksum error — Possible motherboardfailure or RTC battery low. Replace the battery(see the Service Manual on the Dell Supportwebsite at support.dell.com) or contact Dell(see “Contacting Dell” on page 73).CPU fan failure — CPU fan has failed. Replacethe CPU fan (see the Service Manual on the DellSupport website at support.dell.com).