Change A Cmos Battery

    * Make sure the power is off
    * There are sharp edges and all so be carefull
    * Do not remove unnecessary plugs and all-they will have big effect on the computer
    * Do not damage anything inside the case


    * 1your clock starts running slowly
    * when you boot (start) your computer it has a problem finding your hardware (no hard drive, no cd rom)

To change the battery you need the following tools:-

    * a X-point screwdriver
    * an anti-static strap
    * a new battery (without it what are you changing)

** unplug all the cables from the back of the computer as you remove them make a note where they came from. (always rember where the plugs goes back)


Remove the cover by locating the screws around the outer edge (back) of the computer

Some computer cases only require you to remove 2 screws on one side then a panel can be removed allowing you access to the computers insides, others you must remove 6 screws and remove the whole case by sliding it to the rear and lifting it off.

Now make sure that you read the safety instructions about static.

Look inside you will see a round silver thing that looks about the size of a 10p piece (quarter). This is the battery itself, carefully lift the retaining clip and slide the battery out. That’s it removed now go to your local computer retailer, electrical retailer (Tandy/Radio shack) taking the old battery with you and get a new battery.

Back to your computer insert the new battery by lifting the clip and sliding the battery in.

Reinstall your case and plug all the cables back (you did remember to label them didn’t you)


You will now need to go into you bios….

Right the bios is the god of your computer.

To access it, when your computer first starts you will see a black screen with white text.

If you look carefully you will see a line that says something like “press del for setup” or some other key (F2 or ESC or tab) this will take you to god’s house where you can make lots of changes to the way your machine works.

It is also the place where you can make your nice computer in to a rather expensive door stop so be careful and don’t go playing with anything.

You will now be presented with a blue screen with a lot of options on it,

The one we want is load optimized/default settings.

Press the F10 key and type y the computer should now reboot.

If every thing went well then your computer will now be up and running.