System Support

4.4.2 CMOS Archive and Restore

During the boot sequence the BIOS saves a copy of NVRAM (CMOS contents, password(s) and other system variables) in a portion of the flash ROM. Should the system become un-usable, the last good copy of NVRAM data can be restored with the Power Button Override function. This function is invoked with the following procedure:

1.With the unit powered down, press and release the power button.

2.Immediately after releasing the power button in step 1, press and hold the power button until the unit powers down. This action will be recorded as a Power Button Override event.

With the next startup sequence the BIOS will detect the occurrence of the Power Button Override event and will load the backup copy of NVRAM from the ROM to the CMOS.

✎The Power Button Override feature does not allow quick cycling of the system (turning on then off). If the power cord is disconnected during the POST routine, the splash screen image may become corrupted, requiring a re-flashing of the ROM (refer to chapter 8, BIOS ROM).

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Technical Reference Guide