Acer Aspire S7-391 Acer S7-391 Notebook Service Guide - Page 164

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. BIOS Recovery 0 Boot Block 0 An interruption during a BIOS flash procedure (e.g. a power outage) can corrupt the BIOS code, which will cause the system to go into an unbootable state. The BIOS boot block refers to a special BIOS program that can be used to boot up a system with minimum BIOS initialization.You need to access and execute the boot block to reboot the computer and recover the regular BIOS code. Creating the Crisis Disk 0 NOTE: NOTE: The BIOS crisis recovery disk should be prepared in a computer running the Windows XP, Vista, WIN 7 or 8 OS. 1. Prepare a removable USB flash drive. 2. Transfer the HeliumX64.fd file in the USB flash drive's root directory. 3. Eject and reconnect the USB flash drive from the computer. Performing a BIOS recovery 0 NOTE: NOTE: Make sure the battery pack is installed to the system and that the computer is connected to a UPS unit during the BIOS recovery process. The function hotkey sequence Fn+Esc is used to enable the BIOS recovery process when system is powered On during BIOS POST. If this function is enabled, the system will force the BIOS to execute the boot block program. To perform a BIOS recovery: 1. Shut down the BIOS failed-computer. 2. Connect the USB flash drive containing the Crisis Recovery disk files to the computer. 3. Press and hold the Fn+Esc keys, then press the power button . The BIOS recovery process begins. When the process is complete the computer will automatically reboot. 4. Disconnect the USB flash drive from the computer. 5. Perform a BIOS flash procedure to update the BIOS firmware. Refer to the "BIOS Flash Utilities" section on page 2-13 for detailed instructions. 5-6 Jumper and Connector Locations