Dell Technology Guide
Page 275
...documentation shipped with your computer for more about the meaning of the various diagnostic lights displayed, see "Contacting Dell" on the Dell Support website support.dell.com. Possible HDD failure during HDD boot test (see the Service Manual for assistance). If the computer... various keyboard status lights displayed, see "Contacting Dell" on the Dell Support website support.dell.com. H A R D - Diagnostic Lights for Desktop Computers NOTE: If the message you can use the status of certain features. Replace the CPU fan (see the documentation for assistance). System Messages...
...documentation shipped with your computer for more about the meaning of the various diagnostic lights displayed, see "Contacting Dell" on the Dell Support website support.dell.com. Possible HDD failure during HDD boot test (see the Service Manual for assistance). If the computer... various keyboard status lights displayed, see "Contacting Dell" on the Dell Support website support.dell.com. H A R D - Diagnostic Lights for Desktop Computers NOTE: If the message you can use the status of certain features. Replace the CPU fan (see the documentation for assistance). System Messages...