Acer TravelMate Série Mode D'emploi page 76

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Error messages
Memory size
mismatch
If you still encounter problems after going through the corrective
measures, please contact your dealer or an authorized service center for
assistance.
Corrective action
Press <F2> (during POST) to enter the BIOS
utility, then press Exit in the BIOS utility to
reboot.
Frequently asked questions