Dell Precision 390 Quick Reference Guide - Page 40

Light Pattern Problem Description No memory modules are detected. System board failure has occurred. Suggested Resolution 1 Reseat the memory modules to ensure that your computer is successfully communicating with the memory. 2 Restart the computer. 3 If the problem still exists, remove all the memory modules and install one memory module in memory module connector 4. 4 Restart the computer. The following message appears: Alert! Operating in Debug Mode. Please Populate Memory in Pairs for Normal Operation. 5 Press to boot to the operating system. 6 Run the Dell Diagnostics. See page 34 for instructions. 7 If the memory module passes, shut down the computer, remove the memory module, and then repeat the process with the remaining memory modules until a memory error occurs during start-up or diagnostic testing. If the first memory module tested is defective, repeat the process with the remaining modules to ensure that the remaining modules are not defective. 8 When the defective memory module is identified, contact Dell for a replacement.For instructions on contacting Dell, see your User's Guide. NOTE: If necessary, the computer can operate in debug mode until new memory modules are installed. Contact Dell for technical assistance. For instructions on contacting Dell, see your User's Guide. 40 Quick Reference Guide