84 Chapter 4Index of Symptom-to-FRU Error MessageError Message ListNo beep Error Messages FRU/Action in SequenceNo beep, power-on indicator turns off and LCDis blank.Power source (battery pack and power adapter). See “PowerSystem Check” on page 79.Ensure every connector is connected tightly and correctly.Reconnect the DIMM.LED board.Main Board.No beep, power-on indicator turns on and LCDis blank.Power source (battery pack and power adapter). See “PowerSystem Check” on page 79.Reconnect the LCD connectorHard disk driveLCD inverter IDLCD cableLCD InverterLCDMain BoardNo beep, power-on indicator turns on and LCDis blank. But you can see POST on anexternal CRT.Reconnect the LCD connectors.LCD inverter IDLCD cableLCD inverterLCDMain BoardNo beep, power-on indicator turns on and ablinking cursor shown on LCD during POST.Ensure every connector is connected tightly and correctly.Main BoardNo beep during POST but system runscorrectly.SpeakerMain BoardLCD-Related SymptomsSymptom / Error Action in SequenceLCD backlight doesn't workLCD is too darkLCD brightness cannot be adjustedLCD contrast cannot be adjustedEnter BIOS Utility to execute “Load Setup Default Settings”, thenreboot system.Reconnect the LCD connectors.Keyboard (if contrast and brightness function key doesn't work).LCD inverter IDLCD cableLCD inverterLCDMain BoardUnreadable LCD screenMissing pels in charactersAbnormal screenWrong color displayedReconnect the LCD connectorLCD inverter IDLCD cableLCD inverterLCDMain BoardLCD has extra horizontal or vertical linesdisplayed.LCD inverter IDLCD inverterLCD cableLCDMain Board
