Acer TravelMate 4520 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 89
I/O-related Symptoms, Symptom / Error, Action in Sequence - driver for
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I/O-related Symptoms Symptom / Error System configuration values does not match the installed devices. External display does not work correctly. USB does not work correctly Print problems Keyboard (one or more keys) does not work. Touchpad does not work. Internal modem does not work correctly. Action in Sequence Run the Setup Utility, then press F9 to load the system defaults. Reconnect hard disk/CD-ROM/diskette drives. Press Fn+F5, LCD/CRT/both display switching System board System board Run printer self-test. Printer driver Printer cable Printer System board Reconnect the keyboard cable. Keyboard System board Reconnect the touchpad cable. Touchpad board System board Modem port Modem board System board Chapter 4 79