Dell Technology Guide
Page 275
... fan (see "Contacting Dell" on the Dell Support website support.dell.com. Possible HDD failure during HDD boot test (see the Service Manual for either the operating system or the program that was running when the message appeared. PREVIOUS ATTEMPTS AT BOOTING THIS SYSTEM HAVE FAILED AT CHECKPOINT [NNNN]. C M O S C H E C K S U M E R R O R - Possible motherboard failure or RTC battery...
... fan (see "Contacting Dell" on the Dell Support website support.dell.com. Possible HDD failure during HDD boot test (see the Service Manual for either the operating system or the program that was running when the message appeared. PREVIOUS ATTEMPTS AT BOOTING THIS SYSTEM HAVE FAILED AT CHECKPOINT [NNNN]. C M O S C H E C K S U M E R R O R - Possible motherboard failure or RTC battery...