Acer Aspire S7-391, Service Manual, Page: 54 / 186

2-16
System Utilities
Removing the BIOS Passwords
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To clear a lost BIOS password (user or supervisor password), you need to short the clear
password hardware gap (G2201) located on the mainboard.
Figure 2-13. G2201 Hardware Gap
1. Shut down the computer and disconnect the AC adapter and all other peripherals from the
computer.
2. Perform the “ Removing the Lower Case ” procedure described on page 3-7 .
3. Perform the “ Removing the Battery Pack ” procedure described on page 3-8 .
4. Perform the “ Removing the M-SATA Board ” procedure described on page 3-15 .
5. Locate the G2201 gap.
6. Use an electrical conductivity tool to short the two contacts on the hardware gap together.
7. While resting the tool on the two contacts, plug one end of the AC adapter into the DC-in
jack and plug one end to an electrical outlet.
8. Press the button to turn on the computer.
9. After the BIOS POST, remove the tool from the hardware gap.
10. Perform the “ Reinstalling the M-SATA Board ” procedure described on page 3-60 .
11. Perform the “ Reinstalling the Battery Pack ” procedure described on page 3-67 .
12. Perform the “ Reinstalling the Lower Case ” procedure described on page 3-69 .
13. Turn on the computer and press F2 during bootup to access the Setup Utility . If no
password prompt appears, the BIOS passwords have been cleared. If the prompt
appears, repeat steps 2-13 until the BIOS passwords have been cleared.
14. Press F9 to load the system defaults.
15. Press F10 to save the changes you made and close the Setup Utility.