Dell OptiPlex 390 Mini-Tower Owner's Manual

• If the problem persists, the system board is faulty.LEDPower ButtonProblem Description A possible coin cell battery failure has occurred.Troubleshooting Steps Remove the coin cell battery for one minute, reinstallthe battery, and restart.LEDPower ButtonProblem Description A possible processor failure has occurred.Troubleshooting Steps Re-seat the processor.LEDPower ButtonProblem Description Memory modules are detected, but a memory failure hasoccurred.TroubleshootingSteps • If two or more memory modules are installed,remove the modules, then re-install one module andre-start the computer. If the computer startsnormally, continue to install additional memorymodules (one at a time) until you have identified afaulty module or reinstalled all modules withouterror.73