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My laptop screen and using external screen features will not display anything except error 161 and 163. I have the cord hooked into the wall, so why won't it work?

Sounds like you need a new CMOS battery; IBM calls it the "Backup Battery".
Error 161 is "Dead Backup Battery".
Error 163 is "Set Date and Time".Technical manual at...
http://download.lenovo.com/ibmdl/pu...
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Thanks to both of you! I will call around and see if any computer stores carry tis battery or if I have to purchase it online!!

how about rite-aid(US). it has been awhile since I changed the battery on a 600..but, if I recall correctly it is the same battery that most desktops use, cr2032, 3v.
if yours isnt, take it with yoularry

It's a CR-2025 battery with a pigtail on it.
http://www.amazon.com/IBM-02K6502-R...
http://jcbattery.com/catalog/produc...
Your laptop type is 2645-55u
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Thanks! I did not realize that Amazon sold computer batteries such as mine needed! I have used Amazon in the past for DVD's and books, but WOW! Thanks again!

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