Need to change the bios battery - Acer Aspire Z3771-UR20P - P G630 2.7 GHz - 21.5 TFT DO.SL2AA.001 -

The BIOS battery keeps the Date & Time and the BIOS settings from changing. If the BIOS battery is flat then these settings are changed to the factory settings.
Yuo need to insert a new BIOS battery then go into the BIOS setting to set the Date & Time etc.

open cpu motherboard looks bios battery then change

Yes you need to install a new BIOS battery. The old BIOS battery is flat and it cannot keep (store) the BIOS setting. Most motherboards use a coin size lithium 3 volt battery type CR2032 button battery.
Check the type of BIOS battery your motherboard uses.
When you replace the BIOS battery, go into the BIOS and set the Date and Time.

The other way is to remove the BIOS battery and let it stand for 20 plus minutes, then insert the BIOS battery back into the computer. The BIOS settings will then be returned to the factory default settings, you then need to go into the BIOS setting and change the Date and Time setting.

If you change the BIOS date and time and when you boot up next time and the date and time has changed back or is incorrect, then the most likely fault is a flat BIOS battery. Replace the BIOS battery, it maybe a coin type lithium 3volt battery. this is the most common type used in motherboards is a CR2030 lithium battery.

Try This:

How to Change/Reset a BIOS password Posted on 30 December 2008
Tags: Tech News, Tutorials If you are a normal computer user who has forgot his BIOS password and you are unable to access to your BIOS, then you need a simple way to change your BIOS. Its not that hard because you just need a simple trick to reset your BIOS password.
Open your CPU cabinet after switching OFF the power and then try to locate the CPU battery which can be found very easily. Once you locate your battery you need to remove it once and restart your PC without the battery.

Note : Once you remove your battery from the mother board, you will find that all your time settings in your computer would be lost, and some softwares may stop working which are based on your computer time.


You need to shut down your PC again and now add back the battery which will enable you the time saving feature and also reset your BIOS password.

Try This:
Reseat the CMOS battary:

How to Change/Reset a BIOS password Posted on 30 December 2008
Tags: Tech News, Tutorials If you are a normal computer user who has forgot his BIOS password and you are unable to access to your BIOS, then you need a simple way to change your BIOS. Its not that hard because you just need a simple trick to reset your BIOS password.
Open your CPU cabinet after switching OFF the power and then try to locate the CPU battery which can be found very easily. Once you locate your battery you need to remove it once and restart your PC without the battery.

Note : Once you remove your battery from the mother board, you will find that all your time settings in your computer would be lost, and some softwares may stop working which are based on your computer time.


You need to shut down your PC again and now add back the battery which will enable you the time saving feature and also reset your BIOS password.

Your bios defaulted. The battery keeps: date, time, and bios settings. You need to get in your bios and change the settings to what they need to be. You can enter the bios by hitting DEL during boot.

- do a bios update (or downgrade if needed) to see if it fixes the issue

- but probably the BIOS battery is not keeping the proper voltage anymore, and it automatically resets the BIOS (do the bios setting that u change, remain changed after unpluging/pluging the comp ?!). Try keeping the computer pluged in for a day and see if the battery charged properrly (if the set date remains )... if not ..change the battery.

- as for the self starting, there is a setting in the BIOS, that activates/dissables that ! - see u;re user manual ...