Acer Extensa 4220 TravelMate 4320/4720 and Extensa 4220/4620 Service Guide - Page 116

Power Management-Related Symptoms Symptom / Error The system doesn't resume from hibernation mode. The system doesn't resume from standby mode after opening the LCD. Battery fuel gauge in Windows doesn't go higher than 90%. System hangs intermittently. Action in Sequence See "Save to Disk (S4)" on page 44. Hard disk connection board Hard disk drive Mainboard See "Save to Disk (S4)" on page 44. LCD cover switch Mainboard Remove battery pack and let it cool for 2 hours. Refresh battery (continue use battery until power off, then charge battery). Battery pack Mainboard Reconnect hard disk/CD-ROM drives. Hard disk connection board Mainboard Peripheral-Related Symptoms Symptom / Error System configuration does not match the installed devices. External display does not work correctly. USB does not work correctly Print problems. Serial or parallel port device problems. Action in Sequence Enter BIOS Setup Utility to execute "Load Default Settings", then reboot system. Reconnect hard disk/CD-ROM/diskette drives. Press Fn+F5, LCD/CRT/Both display switching Mainboard Mainboard Ensure the "Parallel Port" in the "Onboard Devices Configuration" of BIOS Setup Utility is set to Enabled. Onboard Devices Configuration Run printer self-test. Printer driver Printer cable Printer Mainboard Ensure the "Serial Port" in the Devices Configuration" of BIOS Setup Utility is set to Enabled. Device driver Device cable Device Mainboard Keyboard/Touchpad-Related Symptoms Symptom / Error Keyboard (one or more keys) does not work. Action in Sequence Reconnect the keyboard cable. Keyboard Mainboard 106 Chapter 4