39Using Support ToolsAlert! 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 61).CMOS checksum error — Possible systemboard failure or RTC battery low. Replace thebattery (see the Service Manual atsupport.dell.com/manuals) or contact Dell (see“Contacting Dell” on page 61).Hard-disk drive failure — Possible hard-diskdrive failure during POST. Contact Dell (see“Contacting Dell” on page 61).Hard-disk drive read failure — Possible hard-disk drive failure during HDD boot test. ContactDell (see “Contacting Dell” on page 61).Keyboard failure — Keyboard failure orloose cable. Replace the keyboard (see theService Manual at support.dell.com/manuals).No boot device available — No bootablepartition on hard drive, the hard drive cable isloose, or no bootable device exists.If the hard drive is your boot device, ensure•that the cables are connected and that thedrive is installed properly and partitioned asa boot device.Enter system setup and ensure that the boot•sequence information is correct (see the DellTechnology Guide available on your harddrive or at support.dell.com/manuals).No timer tick interrupt — A chip on the systemboard might be malfunctioning or system boardfailure. Contact Dell (see “Contacting Dell” onpage 61).