Acer Aspire V3-571G Acer Aspire V3-571 and V3-571G Notebook Service Guide - Page 196

Other Functions Failure If other functions such as the CRT switch, HDMI switch, LAN connection, external microphone, external speaker, or USB 3.0, perform the following: 1. Check if the drive is ok. 2. Check if the test utility is ok. 3. Swap the mainboard. BIOS Problems Forget BIOS Password If the user forgets the BIOS password, discharge CMOS by shorting the JCMOS1 connector. Refer to Clearing the Password Check and BIOS Password on page 2-22. Random Loss of BIOS Settings If the computer is experiencing intermittent loss of BIOS information, perform the following: 1. If the computer is more than one year old, replace the CMOS battery. 2. Run a complete virus scan using up to date software to confirm the computer is virus free. 3. If the computer is experiencing HDD or ODD BIOS information loss, disconnect and reconnect the power and data cables between devices. 4. If the BIOS settings are still lost, replace the cables. 5. If HDD information is missing from the BIOS, the drive may be defective and should be replaced. 6. Replace the Motherboard. 7. If the issue is still not resolved, refer to Online Support Information on page 8-2. Troubleshooting 4-18