38Using Support ToolsSystem MessagesIf your computer has an issue or an 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 55 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 (see “Contacting Dell” on page 55for assistance).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 see “ContactingDell” on page 55 for assistance).CPU fan failure — CPU fan has failed. Replacethe CPU fan (see the Service Manual on the DellSupport website at support.dell.com).Hard-disk drive failure — Possible hard diskdrive failure during POST (see “Contacting Dell”on page 55 for assistance).Hard-disk drive read failure — Possible harddisk drive failure during HDD boot test (see“Contacting Dell” on page 55 for assistance).Keyboard failure — Keyboard failure orloose cable. Replace the keyboard, see theService Manual on the Dell Support website atsupport.dell.com.