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I have a Toshiba Satellite L305 and it would not turn on. After a day or two, I tried turning the computer again and it turned on with the following message: "CMOS Battery Failure," F1 to continue F2 to Set UP. I selected F1 and Windows Vista started normally. The computer worked fine until I tried to turn it on again and nothing happened...nothing on the monitor, but I do see lights on the front edge of the computer when the AC adapter is plugged in. The computer will be 2 years old at years end so it's out of warranty. What does the error message mean? Is it just a CMOS Battery that is failing and needs to be replaced, or is it motherboard related? If the CMOS Battery needs to be replaced, is there a tutorial or step-by-step instructions on how to repair. Also, where is the CMOS Battery located at on my system?

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Hi There,

Here is a ste by step guide for disassembling the L355 which is almost identical to the L305. Your problem IS the cmos and not your motherboard. Toshiba does not make service manuals available so this site is the "go to" place for many laptop repair guys like myself for help.

If the procedure looks a little over the top for you, consult with a friend or contact who can do this confidently and well.

Best Regards

Posted on Aug 29, 2010

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