Acer Aspire E1-422G - Manual (Page 87)

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Troubleshooting
This chapter shows you how to deal with common system problems. 
Read it before calling a technician if a problem occurs. Solutions to more
serious problems require opening up the computer. Do not attempt to
open the computer yourself; contact your dealer or authorized service
center for assistance.
Troubleshooting tips
This computer incorporates an advanced design that delivers onscreen
error message reports to help you solve problems.
If the system reports an error message or an error symptom occurs, see
"Error messages" below. If the problem cannot be resolved, contact your
dealer. See "Requesting service" on page 85.
Error messages
If you receive an error message, note the message and take the corrective
action. The following table lists the error messages in alphabetical order
together with the recommended course of action.
Error messages Corrective action
CMOS battery bad
Contact your dealer or an authorized service
center.
CMOS checksum
error Contact your dealer or an authorized service
center.