Acer Aspire XC600 Service Manual page 87

5. Reboot the computer.
6. Press Delete to run the CMOS Setup Utility.
7. Press F9 to load the system default settings.
8. Select Ok, then press Enter.
9. Press F9 to save the default settings and close the Setup utility.
10. Select Ok, then press Enter.
Aspire XC600 Service Guide 79