Finding were the cmos battery on my 2008 compaq computer

Well, I haven't worked on a Compaq for a few years but they're one of the models that respond to having the CMOS battery removed.

Basically, remove battery, find location of CMOS battery (usually under memory cover or HDD cover) and disconnect or pull it out for 30 minutes and you should be back to factory defaults.

Which operating system ?
The Compaq Presario CMOS password is an administrative security measure built into the firmware of a Compaq computer.

This password is stored in the motherboard's BIOS (Basic Input Output System) and provides for hardware-level security.

This password may be accidentally set or forgotten over time and must be reset in order to boot the computing system.

Disconnect the Compaq computer from any electrical sources and remove the side access panel from its case.

This may require the removal of one or more thumbscrews on the rear of the computer case.


WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. http://www.kitchentablecomputers.com/static.php - rules

Locate the CMOS battery.

This battery is a round button-type battery located in the bottom-right corner of the Compaq Presario motherboard.

Grip the battery by its edges and pull it straight away from the motherboard to remove it.


Press and hold the power button on the case for ten seconds to remove any remaining electrical current from the computer.

This removes the CMOS settings and returns it to the default state of having no password set.

Replace the CMOS battery.


Replace the computer's side access panel and re-establish any previously severed electrical connections.
http://www.youtube.com/watch?v=zjGHpJqVJkM
Replace a CMOS battery inside a desktop computer

http://www.dewassoc.com/support/bios/bios_password.htm

http://www.tips4pc.com/articles/Computer Troubleshooting/Remove the CMOS battery to reset the bios password.htm

The CMOS cell is located on the motherboard; however the process of getting to the area is difficult. One small mistake and the entire computer is finished. Best a Professional who has the technical skills to open the case and get to the internal parts could save the day. If the computer is old, the cost is far too great to get professional assistance. If you still feel you are comfortable disassembling the computer, go to HP.Com and locate the computer, get the service manual and follow the directions from there.

try this: Make sure the battery for the notebook is out in step 8


the procedure to reset the CMOS/BIOS is in the maintenance and service guide on page 46.

Follow these steps to clear the password:
NOTE: These steps also clear CMOS.
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
4. Remove the battery (see Battery on page 48).
5. Remove the real-time clock (RTC) battery (see RTC battery on page 68).
6. Wait approximately 30 minutes.
7. Replace the RTC battery and reassemble the computer.
8. Connect AC power to the computer. Do not reinsert any batteries at this time.
9. Turn on the computer.
All passwords and all CMOS settings have been cleared.

If this is for the same question where you mention the Compaq CV735 Monitor then there are no CMOS batteries in monitors - these are only found in the main computer unit not peripheral devices.

unplug the power cord, remove the battery pack, remove the cover and remove the CMOS battery for about a minute, then insert again the CMOS battery... your CMOS password will be gone

write down the model number or the volt of your CMOS battery and go to any computer hardware shop..
buy the CMOS battery corresponding to your model number or your battery's volt...

all the CMOS battery are almost similar

To reset the BIOS you will need to remove the main battery & the CMOS battery. To find out how to remove the CMOS battery refer to a service manual if you can find one.

you have to open back side of ur laptop and u can find ur mother board...on that u can see cmos battery...

Yes that was the cmos battery, I'll see if I can find a better solution for this issue for you.