Acer Veriton N4620G - Manual (Page 59)

Frequently asked questions - 59
If you still encounter problems after going through the corrective
measures, please contact your dealer or an authorized service center
for assistance.
Keyboard error or no
keyboard connected Contact your dealer or an authorized service
center.
Keyboard interface
error Contact your dealer or an authorized service
center.
Memory size
mismatch
Press <F2> (during POST) to enter the BIOS
utility, then press Exit in the BIOS utility to
reboot.
Error messages Corrective action