T500 not starting after unplugging power cable

Hi,
I'm looking after a customer's T500 Thinkpad (Win XP). The machine first didn't start at all. I then figured that by removing both battery and RAM, and pressing the power button repeatedly a couple of times, and then like a minute), I could get it to start up.
The machine was in very bad condition, I had to remove a ridiculous amount of spyware and viruses. I also went to the Productivity Center and updated the system, just everything that was updateable (including BIOS).
The only problem I can't solve is that the computer still refuses to start once switched off AND power cable removed. If I leave it plugged in, it would boot, but once the power cord is plugged off, I have to remove battery and ROM again etc...
The regular battery seems to work fine, I was working like an hour only on battery, and it went down to approx. 70 %, so I know the battery is not dead.
I also updated all drivers and software available for Category "Power Management" from the Lenovo suppor site, but still it would work.
I opened the computer and I found a CMOS battery as shown here:
https://itsuperstore.com.au/images/t40%20cmos.jpg Unfortunately, I don't know how to verify if this battery still has power (chances are it doesn't), and if this would have any impact on the booting process.
Could somebody please help me out?
www.justcorebusiness.com

you can take off the CMOS battery, and try to boot the laptop regulary. Having a depleted CMOS doesn't cause the problem you described. The problem you describe usually is something to do with a faulty charging circuit/power management circuit on the laptop.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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