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Chapter 5 113
Clearing Password Check and BIOS Recovery
This section provides you the standard operating procedures of clearing password and BIOS recovery for
Extensa 5635/5635Z/5235. Extensa 5635/5635Z/5235 provides one Hardware Open Gap on main board for
clearing password check, and one Hotkey for enabling BIOS Recovery.
Clearing Password Check
Hardware Open Gap Description
Steps for Clearing BIOS Password Check
If users set a BIOS Password (Supervisor Password and/or User Password) for security reasons, the BIOS will
prompt for a password during system POST or when systems enter to BIOS Setup menu. However, if it is
necessary to bypass the password check, users need to short the HW Gap to clear the password by
performing the following procedure:
1. Power off the system, and unplug the AC and Battery from the machine.
2. Open the Hard Drive and RAM door.
3. Find the appropriate HW Gap on M/B as shown in the picture.
• G2 is the Secondary RTC Reset. This signal resets the manageablility register bits in the RTC
well when the TRTC battery is removed. The SRTCRST# input must always be high when all
other RTC power planes are on. In the case where the RTC Battery is dead or missing on the
platform, the SRTCRST# pin must rise before the RSMRST# pin.
• G3 is the RTC Reset. When asserted, this signal resets register bits in the RTC well. Unless
the CMOS is being cleared (only to be done in the G3 power state), the RTCRST# input must
always be high when all other RTC power planes are on. In the case where the RTC Battery is
dead or missing on the platform, the RTCRST# pin must rise before the RSMRST# pin.
4. Use an electric conductivity tool to short the two points of the HW Gap G3.
5. Plug in AC, keeping the HW Gap shorted, and press Power Button to power on the system till BIOS POST
finish. Then remove the tool from the HW Gap.
6. Restart system. Press F2 key to enter BIOS Setup menu.
If there is no Password request, the BIOS Password has been successfully cleared. Otherwise, please follow
the steps and try again.
NOTE: The steps are only for clearing BIOS Password (Supervisor Password and User Password).