Sony PCV-LX910 System Reference Manual - Page 34

20 VAIO Slimtop™ System Reference Manual Configuring the System Board ✍ The configuration should never need changing unless otherwise directed by a technical support or service technician. ! Before opening the system unit, save and close all open files, exit all open applications, turn off the power to all attached peripheral devices, shut down the computer, and unplug the power cord. There are two configuration switches on the system board: ❑ CMOS Clear switch ❑ Onboard VGA Interrupt (AGP_INT) switch When the CMOS Clear switch is in the Normal position, it provides normal access to the BIOS Setup Utility. The Central Processing Unit (CPU) input clock is forced to remain at 100 MHz (fast mode), and the Basic Input/Output System (BIOS) uses the User CMOS settings (as opposed to the System CMOS settings). The CMOS and NVRAM settings are only cleared if the checksum test returns false. Access to specific setup fields is controlled by a supervisor password or user password. When the CMOS Clear switch is in the Clear position, the password that is stored in CMOS is cleared. No other parameters are cleared. While the CMOS switch is in the Clear position, the system will not boot up at all. To clear your password, after setting the switch to the Clear position, wait 2-3 seconds, and then set the switch to the Normal position. If you install a VGA PCI add-in card, you can use the AGP_INT switch to enable or disable the onboard VGA controller.