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how to unlock ibm thinkpad 600?

Power on I get kb amounts, then numbers 161, 301, 16B. So, tempted to press enter, it then clicks on to a locked padlock. what to do. Please help/thank you
Christine, August 2010
The error codes indicate a bad CMOS backup battery.

For how to fix it go to www.lenovo.com and download the Hardware Maintenance Manual for the TP600.

T, August 2010
link Click here to see other fixes for IBM Thinkpad.