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How do I reset the password or bios on IBM Thinkpad 2626?

I just received a IBM Thinkpad 390, 2626-500, s/n 11L40. PII. The owner said that it was working fine but when he booted today a screen with a lock & a monitor popped up. How do I reset the bios or password so I can work on it? Thanks for your time. Ed
2 Solutions
It's old enough that removing the cmos battery(if it's not soldered) will probably reset the password.
You're in luck...according to the HMM (Hardware Maintenance Manual) I found on the Lenovo site, on page 69 it shows the CMOS battery under a removable cover on the bottom that also houses the modem.  

Removing the AC adapter, the laptop battery and this little sucker should reset the CMOS and get you to a bootable BIOS.  Best of luck!    
By the way, with that particular model, only the Power On password can be reset.
EtrixAuthor Commented:
It worked . It was right next to the modem like Noam said. Thanks you to all that helped.  Thanks for your time. Ed

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