Dell Technology Guide
Page 275
... Computers Typically laptop computers have keyboard status lights located above the keyboard. Possible motherboard failure or RTC battery low. Possible HDD failure during HDD boot test (see the Service Manual for your computer). Replace the CPU fan (see "Contacting Dell" on page 337 for assistance). Troubleshooting 275 FOR HELP IN RESOLVING THIS PROBLEM...
... Computers Typically laptop computers have keyboard status lights located above the keyboard. Possible motherboard failure or RTC battery low. Possible HDD failure during HDD boot test (see the Service Manual for your computer). Replace the CPU fan (see "Contacting Dell" on page 337 for assistance). Troubleshooting 275 FOR HELP IN RESOLVING THIS PROBLEM...