Acer TravelMate 4750 - Manual (Page 70)

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If you still encounter problems after going through the corrective measures,
please contact your dealer or an authorized service center for assistance.
Keyboard interface
error Contact your dealer or an authorized service center.
Memory size
mismatch Press (during POST) to enter the BIOS utility,
then press Exit in the BIOS utility to reboot.
Error messages Corrective action