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hi, The board on that laptop uses a traditional CR2032 battery. This battery you can find at almost any jewlers or electronics shop. (ref) You can see it in images such as this one or this one.
Now you knwo the battery type, and where in the board is located :) As for how to access it I think this instructions (see step #13) are very similar for the C500 or given the physical similarities use the C300 instructions.
check if u installed any new device recently. unplug all external cards like PCMCIA, USB drives, Memory cards and any USB device and try it again. if it continues, go to your bios settings and check your boot settings, make sure it boots from hard drive and not CD/DVD drive. if you have done any setting to the bios, revert it and try to start again. if it continues, check your keypads and buttons and make sure you don't have a sticky key or button that is pressed down. Cheers!
It may just be a default setting in the new BIOS. Enter the BIOS setup and check the SATA mode - I've seen this occur with the ACHI mode for example. Otherwise you could try Safe Mode and see if you can get into Windows at all. You can also press F8 while booting and select the option to Disable Automatic Reboot so that you can see the Error that is occuring for further diagnosis.
If you hook it back up in your machine, power down, and remove the CMOS battery on the board (looks like a watch battery) THIS WILL CLEAR THE PASSWORD in most cases. Once you put it back in after a few minutes, you may need to check the BIOS boot time and date, and other settings again to be sure nothing custom set has reverted to default settings.
you will need to disconnect the cmos battery for a few seconds to allow the bios settings to revert to default, reconnecting the cmos battery will allow you to boot up without a password, howver any changes which were made to bios settings will be lost....have you tried pressing f8 while booting, then selecting the option "last known good configuration" ?