I want to replace my cos battery but I need help on how to do this. Computer comes on then shuts back down. It was not turned on fo several months. Also how do I find what battery I need . Any help would be appreciated.

That is what happends after a long time of not keeping a PC plugged in power socket. Also corrupted bios is also what happends quite often.

Try to find battery here:

http://www.watch-rechargeable-digital-camera-batteries-wholesale.paginadigital.com.ar/batteries-d.asp?Cat=Lithium+Coin+Type

and bios here:

http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?lc=en&cc=us&os=228&tool=softwareCategory&product=95594&dlc=en&softwareitem=37461

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