Acer TravelMate 4520 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 88

Memory-related Symptom Symptom / Error Action in Sequence Memory count (size) appears different from actual size. Run the Setup Utility, then press F9 to load the system defaults. DIMM System board Audio-related Symptoms Symptom / Error In Windows multimedia programs, no sound comes from the computer. Internal speakers emit noise or emit no sound. Audio driver Speaker System board Speaker System board Action in Sequence Power Management-related Symptoms Symptom / Error Action in Sequence The system will not enter hibernation mode. Check the system hibernation settings. Press the key, then select ePower Management from the Empowering Technology interface. Keyboard (if control is from the keyboard) Hard disk drive System board The system will not enter hibernation mode and emits four short beeps every minute. Press Fn+o and see if the computer enters hibernation mode. Check the system hibernation settings. Press the key, then select ePower Management from the Empowering Technology interface. Touchpad Keyboard Hard disk drive System board The system does not enter standby mode after closing the notebook lid. Check the system hibernation settings. Press the key, then select ePower Management from the Empowering Technology interface. System board The system will not leave hibernation mode. Hard disk drive System board The system doesn't resume from standby System board mode after opening the LCD. Battery fuel gauge in Windows doesn't go higher than 90%. Remove the battery pack and let it cool for two hours. Refresh the battery pack (continue battery usage until power is depleted, then recharge the battery). Battery pack System board System hangs intermittently. Reinstall the system drives (HDD/ODD). System board 78 Chapter 4